Both can be correct; they ask different things. Choose based on what you want to learn.
- "How did you know?"
- Tense: past.
- Use when referring to a completed act of knowing or a past moment when someone learned, discovered, or correctly guessed something.
- Typical contexts: someone made a correct prediction, revealed information, or behaved in a way that showed prior knowledge.
- Examples: "How did you know it was my birthday?" "How did you know the password?"
- "How do you know?"
- Tense: present (general).
- Use when asking about current basis, evidence, or method for knowing something now, or to
Both can be correct; they ask different things. Choose based on what you want to learn.
- "How did you know?"
- Tense: past.
- Use when referring to a completed act of knowing or a past moment when someone learned, discovered, or correctly guessed something.
- Typical contexts: someone made a correct prediction, revealed information, or behaved in a way that showed prior knowledge.
- Examples: "How did you know it was my birthday?" "How did you know the password?"
- "How do you know?"
- Tense: present (general).
- Use when asking about current basis, evidence, or method for knowing something now, or to challenge the reliability of a belief/claim.
- Typical contexts: questioning someone's source, method, or justification for a belief or statement that still holds or is being asserted.
- Examples: "How do you know that the meeting is at 3?" "How do you know ghosts exist?"
Nuances and pragmatic notes:
- "How did you know?" can also be rhetorical or emotionally loaded (surprise, gratitude).
- "How do you know?" can imply skepticism and may come across confrontational depending on tone.
- If you need to reference an ongoing process that began in the past and continues, use present perfect: "How have you known?" is rare; more natural: "How long have you known?" or "How did you come to know this, and do you still?"
Pick the one matching the time-frame and pragmatic stance you intend.
I'm into math, but I think I can contribute here as well.
Asking about their correctness, I won't hesitate to pronounce both as correct: usage is just what differentiates them.
How did you know?
A positive response to this question could be, “I knew it by …”
This question is in past simple tense. Equivalently, one would ask the same question in an explicit form as, “How did you come to know?” Here the action of knowing is shown to have taken place in the past. The question as to whether the knowledge is still there in the respondent is immaterial: it could be there or not.
How do you know?
A positiv
I'm into math, but I think I can contribute here as well.
Asking about their correctness, I won't hesitate to pronounce both as correct: usage is just what differentiates them.
How did you know?
A positive response to this question could be, “I knew it by …”
This question is in past simple tense. Equivalently, one would ask the same question in an explicit form as, “How did you come to know?” Here the action of knowing is shown to have taken place in the past. The question as to whether the knowledge is still there in the respondent is immaterial: it could be there or not.
How do you know?
A positive response to this question could be “I know it because…”
This question is in present simple tense. Implicitly the question asks, “What makes you know?” Unlike in the previous question above, if the respondent to this question claims to know, then it is expected that he or she still possesses the knowledge.
NB: Both questions - “How did you know?” and “How do you know?” - could be be asking for a process involved in acquiring knowledge: the former being in past and latter in present.
Actually both are correct.
The action here is in the past tense. The key word is “did.” Asking “how did you know” can be explained by stating “I witnessed the accident personally two days ago.”
The action here is in the present tense. The key word is “do.” Asking “How do you know” can be explained by stating “I know because the experiment is perfect.”
I bid you Peace, Auf Wiedersehen!
Both are correct, only tense differs.
How did you know? (Past)
How do you know? (Present).
“HOW DO YOU KNOW”IS BEFORE THE ANSWER. “HOW DID YOU KNOW IS AFTER”.
Both are correct.
How do you know? This is present simple tense, used for things that happen regularly or always.
So: How do you know there is a god? How do you know that guy? How do you know the sky is blue?
How did you know? This is past simple, used for things that happened in the past.
So: How did you know I would be there? How did you know that an eclipse was coming? How did you know the answers before you heard the questions?
How do you know is present tense
How did you know is past tense.
ANSWER: BOTH are correct.A,B ***
“ How did you know?” Past tense *
“How do you know?”Present tense*
A. Did, verb, past tense
“ How did you know about the bus and train wreck last week?”
“ How did you know about the art contest last Christmas?”
B. “ do”, verb, present tense
“How do you know how to make the chocolate sauce? Is it from a family recipe, a certain cookbook or a magazine clip out?”
Both are correct, but they are about different times.
“How did you know?” is about the past. “How did you know that the lecture last night was cancelled?”
“How do you know?” is about the present.
Student 1 “I am going home, the lecture is cancelled”
Student 2 “How do you know?”
Student 1. “I got an email, Prof Jackson’s daughter is ill, she’s gone home. Check your email!”
How do you know that? is correct
The other question with did might be like this:
How did you find out? or
How did you figure that out?
Both of them are correct in grammatical way but there is one big difference is that one sentence is in past tense (“How did you know?”) and another sentence is in present tense (“How do you know?”).
Both of these questions are correct. It would depend on the context in which you are asking them.
Which is correct: “How did you know?” or “how do you know?”
Both are correct, depending on the context.
- “How did you know?”
- Reference to someone or something in the past
- “How do you know?”
- Refers to the present.
Both are correct but they represent different tenses; how did you know is past tense and how do you know is present tense.
"How did you know?" is grammatically correct in the past tense, while "How do you know?" is grammatically correct in the present tense. The choice between the two depends on the context of the conversation.
You know i know
Let’s take an example where something like those sentences is typically said. Tom: “Drug dealers are awful people.” Sally: “My mother was a drug dealer, and she was very nice.” Tom: “I’m sorry. I didn’t mean to insult your mother.” Sally: “That’s okay. How could you have known?” Sally is saying that Tom had no way to know about her mother’s occupation, so she’s not angry.
“How could you know?” is more likely in a situation where the speaker doubts the other person’s ability to know something. For example, Bob: “The Pope certainly has a girlfriend.” Gwen: “How could you know that? You’re not eve
Let’s take an example where something like those sentences is typically said. Tom: “Drug dealers are awful people.” Sally: “My mother was a drug dealer, and she was very nice.” Tom: “I’m sorry. I didn’t mean to insult your mother.” Sally: “That’s okay. How could you have known?” Sally is saying that Tom had no way to know about her mother’s occupation, so she’s not angry.
“How could you know?” is more likely in a situation where the speaker doubts the other person’s ability to know something. For example, Bob: “The Pope certainly has a girlfriend.” Gwen: “How could you know that? You’re not even Catholic.”
“How would you (ever) have (ever) known that?” would probably be a serious question about how someone managed to acquire some knowledge in the past. For example, Jack: “When I worked at Acme Hardware, I got a promotion because I informed the boss that our TNT formula wasn’t quite right.” Jill: “How would you ever have known that? You’re not a chemist.”
If those examples don’t answer your question, you’ll have to provide more information.
Both are correct. “How did you know?” is in past tense and “how do you know?” is in present tense
It depends on the time involved. If you’re talking about something that happened recently, then it’s “How did you know?” If it’s right now, then it’s “How do you know?”
Either is correct depending on the circumstance.
Either one is fine in the proper context.
How do you know
is correct.
Im not a native speaker but:
How did you know= past tense
How did you know it back then that the police was there?
How do you know= present tense
How do you know how old i am?
Neither is correct. But that is only because of a small, easily corrected mixup. In other words, you’re close, but no cigar.
You’re very close indeed. If you want to get to the metaphorical cigar, try switching the verbs from each of the two phrases In question. That way, each phrase will agree in terms of verb tense. Like this:
- CORRECT: I knew you could do it.
- CORRECT: I know you can do it.
Never like this:
- INCORRECT: I knew you can do it. (X)
- INCORRECT: I know you could do it. (X)
It all hinges on which tense you need to use. Are you talking about the past? “Knew” and “could” are the past tense ver
Neither is correct. But that is only because of a small, easily corrected mixup. In other words, you’re close, but no cigar.
You’re very close indeed. If you want to get to the metaphorical cigar, try switching the verbs from each of the two phrases In question. That way, each phrase will agree in terms of verb tense. Like this:
- CORRECT: I knew you could do it.
- CORRECT: I know you can do it.
Never like this:
- INCORRECT: I knew you can do it. (X)
- INCORRECT: I know you could do it. (X)
It all hinges on which tense you need to use. Are you talking about the past? “Knew” and “could” are the past tense verbs that you need to use. Are you talking about the here-and-now, the present? “Know” and “can” are the right present tense verbs.
See there? I knew you could do it!
One is in the past and one in the present.
“How did you know what the ending of the book would be?”
“How do you know who's going to win the game?”
Both are correct but they will usually be used in different situations. You should give us sample sentences if you want to know whether you’re using them appropriately.
For example, “Did you know” is commonly used either to remind someone of something, e.g. “Did you know that you have to pay this bill before the end of the month?” or to present some interesting fact, e.g. “Did you know that the Nobel Peace Prize is always awarded in Oslo, Norway?” Of course, there are other possibilities, such as to ask for information about the past, e.g. “Did you know Marmaduke McGillicuddy when you were at s
Both are correct but they will usually be used in different situations. You should give us sample sentences if you want to know whether you’re using them appropriately.
For example, “Did you know” is commonly used either to remind someone of something, e.g. “Did you know that you have to pay this bill before the end of the month?” or to present some interesting fact, e.g. “Did you know that the Nobel Peace Prize is always awarded in Oslo, Norway?” Of course, there are other possibilities, such as to ask for information about the past, e.g. “Did you know Marmaduke McGillicuddy when you were at school?”
As for “Do you know,” it’s usually used just to ask for information, e.g. “Do you know when the next solar eclipse will be?” and “Do you know who ate all the cookies?” and “Do you know Marmaduke McGillicuddy?”
Sometimes either can be used in a rhetorical question, where the intent is to give someone a message, not to get an answer, e.g. “Do/did you know you’re really stupid?” and “Do/did you know that I’ve always loved you?”
I disagree with what Inderjit Wassi says below. Both statements are rhetorical, indicating some annoyance. Let’s suppose that John asks his wife, “Where did I put my bank statements?” The wife is annoyed because John never tells her where he puts anything, and perhaps he’s also so disorganized that she never bothers to keep track of his stuff. She responds, “How would I know?” The meaning is that there is no possible, imaginable way she could know the answer to John’s question, and he is just bothering her.
“How do I know?” also can indicate annoyance, but it’s less specific. It does not mean “
I disagree with what Inderjit Wassi says below. Both statements are rhetorical, indicating some annoyance. Let’s suppose that John asks his wife, “Where did I put my bank statements?” The wife is annoyed because John never tells her where he puts anything, and perhaps he’s also so disorganized that she never bothers to keep track of his stuff. She responds, “How would I know?” The meaning is that there is no possible, imaginable way she could know the answer to John’s question, and he is just bothering her.
“How do I know?” also can indicate annoyance, but it’s less specific. It does not mean “there is no possible, imaginable way I could know the answer” but simply “I do not know, and why are you even asking me?” You can ask this question rhetorically in conversation when you don’t have all the facts. “I read someplace that there’s a place in Georgia where most people live to be 120 years old. It must be a genetic thing. But how do I know?”
Just as a pattern, we can express past action with verbs by saying either “walked” or “did walk,” “played” or “did play,” “traveled” or “did travel,” and so forth. “Walked” and “did walk” mean the same thing and refer to the past in the same way. The “did walk” form is useful because we can turn it around to ask questions: We can say “You walked to the store”; we can also say “You did walk to the
Just as a pattern, we can express past action with verbs by saying either “walked” or “did walk,” “played” or “did play,” “traveled” or “did travel,” and so forth. “Walked” and “did walk” mean the same thing and refer to the past in the same way. The “did walk” form is useful because we can turn it around to ask questions: We can say “You walked to the store”; we can also say “You did walk to the store” (it means the same thing); we can turn it around and ask, as a question, “Did you walk to the store?” If you use “did” with “walk” to indicate past action, you don’t have to double up and say “did walked”; for that reason, “did walked” isn’t correct. As a statement, you would say, “You walked here this afternoon”; as question, you would ask, “Did you walk here this afternoon?” Both the statement and the question refer to the same time in the past.
The examples that I’ve just given all use regular verbs, “walk,” “play,” and “travel”: Today I walk; yesterday I walked; often I have walked. Your question relates to the irregular verb “see”: Today I see; yesterday I saw; often I have seen. Just as “walked” ...
Just the tenses. ‘How did you know ?’ - past tense. ‘How do you know ?’ - present tense. ‘How DID YOU KNOW that it had never been my intention to attend the lecture ?’ v. ‘How DO YOU KNOW that I shall not be attending, because of a prior engagement ?’
Present tense: Today, I know. Today, I do know. Today, you know. Today, you do know. Today, how do I know? Today, how do you know? // Past tense: Yesterday, I knew. Yesterday I did know. Yesterday, you knew. Yesterday, you did know. Yesterday, how did I know? Yesterday, how did you know?
The difference between the past tense and the present tense, basically.
When a detective has solved a mystery, you might ask s/him afterwards, “How did you know?”
OTOH, if someone makes an uncorroborated or otherwise questionable statement, you might ask s/him: “How do you know?”
One happened already, the other’s taking place now. No mystery, really.
Not quite….
“I know you can do it” - current ability, you can do this now, and I know this now.
“I knew you could do it” - past ability, you could do it then, and I knew it then.
“I knew you can do it” - TENSE CLASH!! this doesn’t work. “can” expresses current ability, but ”knew” is the past simple, so you are talking about a past situation. This means that in the past you were making a future prediction of ability. Future prediction of ability is “will be able to” - but when you are reporting that the prediction was expressed in the past, you change “will” to “would” - so
“I knew you would be abl
Not quite….
“I know you can do it” - current ability, you can do this now, and I know this now.
“I knew you could do it” - past ability, you could do it then, and I knew it then.
“I knew you can do it” - TENSE CLASH!! this doesn’t work. “can” expresses current ability, but ”knew” is the past simple, so you are talking about a past situation. This means that in the past you were making a future prediction of ability. Future prediction of ability is “will be able to” - but when you are reporting that the prediction was expressed in the past, you change “will” to “would” - so
“I knew you would be able to do it” is the way you can express this.
“I know you could do it” - conditional ability - I know this now, and you have the ability to do this, if you decided to - or if the conditions were favourable…. This works - but is it what you meant?
How you know - comes across as a slang. It is the exact opposite translation of a native Indian language.
How do you know - is correct.
Hi!
Do you know who am I" or "Do you know who I am"?
Such questions are called “Indirect” questions, because they don’t ‘directly’ begin with a Wh- question word.
In a Direct question, the positions of the subject and verb change - they get inverted : the verb comes Before the subject. Thus:
She sings ( Statement sentence > subject before verb )
Where ARE you? > (Direct question : verb before Subject).
In an indirect question (or Yes-No ques), the word order, again, the verb comes before the subject. Thus:
He is a dentist . > Is he a dentist?
She was at home. > Was she at home?
They sang. Did they sing
Hi!
Do you know who am I" or "Do you know who I am"?
Such questions are called “Indirect” questions, because they don’t ‘directly’ begin with a Wh- question word.
In a Direct question, the positions of the subject and verb change - they get inverted : the verb comes Before the subject. Thus:
She sings ( Statement sentence > subject before verb )
Where ARE you? > (Direct question : verb before Subject).
In an indirect question (or Yes-No ques), the word order, again, the verb comes before the subject. Thus:
He is a dentist . > Is he a dentist?
She was at home. > Was she at home?
They sang. Did they sing? (Introduce auxiliary do where there is no auxiliary in the statement sentence.)
Now, coming to your sentence:
You know > Do you know …?
There is also an embedded question here (Who am I?) which functions as a relative clause - and here the subject comes before the verb (Who I am). Thus the correct construction will be:
Do you know who I am?
Since this functions as a question, there will be a question mark at the end. [A common mistake in Indian English is to put “who am I” in such a construction , as it is basically a question - So we feel that it should appropriately, have the question format.]
Similarly, in other relative clauses:
I need to know where I can keep this.
Who you are does not matter to us.
I don’t know why she said that.
I didn’t knew is incorrect.
The ideal correct sentence should be I didn’t know.
I have a very simple explaination for this:
Did is already past tense. Knew too is past tense. If you are using did in the sentence, then you should not use the past tense of the verb again.
Another few similar examples:
- Did he not come to the office today? (Came is not correct)
- Did you steal the pen? (Stole is not correct)
I hope this helps. Cheers! :)
You are talking about the difference between present and past tense. “How DO you know?” is for the present time. “How do you know the supervisor is out today?” “How DID you know is for what has already happened, whether 30 seconds ago or 50 years. “How did you know about the job opening here?”
How did you find ——————-? needs an object for the verb “find”. It could be related to locating a place or person; it is often used to ask about a third party’s health, opinion, attitude, etc.
How would you found —————-? This sentence, which sounds so terribly wrong, could also be continued correctly, e.g. by the words “a church or private school”.
Context always informs meaning. Lacking a context one must guess at meaning. Each question is more often used rhetorically; but not always used that way. In any case …
--
“would" indicates the subjunctive mood; so it represents positing a hypothetical situation - defined by [absent] context.
Joe: If I were looking at the circuit-breakers, how would I know any were tripped?
Jill: Instead of a silver tab, the tab would be red.
--
“do" applies to instant circumstances. In asking an informational question, it would be used:
Joe: Since you are looking at the circuit-breakers, are any tripped?
Jill: How do
Context always informs meaning. Lacking a context one must guess at meaning. Each question is more often used rhetorically; but not always used that way. In any case …
--
“would" indicates the subjunctive mood; so it represents positing a hypothetical situation - defined by [absent] context.
Joe: If I were looking at the circuit-breakers, how would I know any were tripped?
Jill: Instead of a silver tab, the tab would be red.
--
“do" applies to instant circumstances. In asking an informational question, it would be used:
Joe: Since you are looking at the circuit-breakers, are any tripped?
Jill: How do I know?
Joe: Instead of a silver tab, that place is red.
Answering: What is the difference between “How do I know” and “how would I know?”
The first one is simple past tense. The speaker wants to know in what way the listener knew/is aware of something in the past.
The second sentence is simple present tense. The speaker wants to know how the listener is aware of/knows something at present time.
Both “I did know” and “I knew” are correct, but you’ll seldom want to say “I did know.” You would use “I did know” to put exceptionally strong emphasis on “did,” perhaps because you want to underline that you did know in answering someone who falsely claims you didn’t know. He: “You had no idea how much of a problem you were causing.” You: “I did know I was causing a problem, but I had no alternat
Both “I did know” and “I knew” are correct, but you’ll seldom want to say “I did know.” You would use “I did know” to put exceptionally strong emphasis on “did,” perhaps because you want to underline that you did know in answering someone who falsely claims you didn’t know. He: “You had no idea how much of a problem you were causing.” You: “I did know I was causing a problem, but I had no alternative.” Another reason you might...
The “how do you know” is when you are asking about HOW did they get that information, what method did they use to reach that information. It does not entail that you think it was impossible for them to achieve it, but you are asking on the procedure of achievement.
“How can you know” denotes that you thought it was impossible for that person to know that, regardless of the method used, so there is the nuance on the fact that you thought accessing that information was impossible or highly unlikely.
“how do you know” asks about the procedure you followed to achieve that information, it does not re
The “how do you know” is when you are asking about HOW did they get that information, what method did they use to reach that information. It does not entail that you think it was impossible for them to achieve it, but you are asking on the procedure of achievement.
“How can you know” denotes that you thought it was impossible for that person to know that, regardless of the method used, so there is the nuance on the fact that you thought accessing that information was impossible or highly unlikely.
“how do you know” asks about the procedure you followed to achieve that information, it does not regard it as impossible, while “how can you know” is nuanced by the thought of impossibility for you to know that information; it does not focus on the method you used to reach it, but it questions the whole possibility of you accessing this information.
It is a bit tangled but I think this is the right interpretation, if someone disagrees please correct me.
How do you know? (for a question)
Questions should always have a helping verb (do) which proceeds the subject.
How you know can be correct as a noun clause, but it must be part of a larger sentence:
Tell me how you know the answer.
Knew - Past tense
Know - Present tense
Didn’t you - Past tense
Don’t you - Present tense
Therefore, you can say:
“You knew, didn’t you?” (both past tense)
or
“You know, don’t you?” (both present tense)
The rule to take away is that you can’t mix tenses in the same sentence. (You can’t say “You knew, don’t you?” or “You know, didn’t you?”
Memorize these words:
ALWAYS
ALWAYS
ALWAYS
USE THE BASE FORM OF A VERB
AFTER
A MODAL AUXILIARY
One more time now:
ALWAYS USE THE BASE FORM OF A VERB AFTER A MODAL AUXILIARY.
And again:
MODAL AUXILIARY + BASE FORM OF VERB
will go not will goes
will go not will going
will go not will went
could be not could being
could be not could was
could be not could been
may have not may has
should say not should says
and so on and so forth…
Just remember the simple rule:
modal auxiliary + base form of verb
How did you knew? is incorrect sentence,
Because we use did in the simple past interrogative and negative tense and 1st form of verb. Therefore, the correct answer is- How did you know?
could have
If you add a question mark after “known” and capitalise the first letter, then the first is correct: “How could they have known?” The second is ungrammatical.
Emeritus Professor Rodney Huddleston, co-author with Professor Geoffrey Pullum of “The Cambridge Grammar of the English Language”, Cambridge University Press, 2002.
If you are asking a question the second version, how do you know, is correct. How you know could be the introduction to a sentence in which how one knows something is explained.
This is incorrect , Actually it would be right if it was written like “How did you know “ because this implies that you are talking about past.
Did and knew both are past tense of do and know. Example- How did you know that the match was cancelled last night?
The phrase "do you know" is usually used when you are trying to find out information that you do not know. "Do" is the present tense, so saying "do you know" would ask if you currently know( at this moment)
For example, you might say "Do you know where Ayomide is?
- Do you know where the restaurant is ?
- Do you know what time is it?
- Do you know how much that wristwatch cost me?
- Do you know we have a C.A test today?
- Do you know if the meeting is still holding?
In each of these examples, the speaker wants to know some piece of information, and they hope the listener can tell them. The speaker does not kno
The phrase "do you know" is usually used when you are trying to find out information that you do not know. "Do" is the present tense, so saying "do you know" would ask if you currently know( at this moment)
For example, you might say "Do you know where Ayomide is?
- Do you know where the restaurant is ?
- Do you know what time is it?
- Do you know how much that wristwatch cost me?
- Do you know we have a C.A test today?
- Do you know if the meeting is still holding?
In each of these examples, the speaker wants to know some piece of information, and they hope the listener can tell them. The speaker does not know the information being asked for.
While, “You know” is used to highlight or to draw attention to, focus attention on what you are saying.
People use you know when they are doubtful about what they are saying or what they are going to say next
- He's generous and, you know, very nice, very polite.
- I thought I'd, you know, have a chat with you.
You use you know when you are trying to explain more clearly about what you mean, by referring to something that the person you are talking to knows about, know a fact, or already know that fact.
- you know that Micheal Jordan is the greatest basketball player of all time.
- you know that Mom can cook better than dad?
you can check You know definition and meaning | Collins English Dictionary for more information about “You know”
Which is correct, “How would you found” or “How did you find”?
The first one is wrong. After “would” you have to use a short infinitive, e.g.,
“How would you find…”
The second one is correct.
