dude I can't understand anything you write.

You keep going with this homework excuse

Yes. It's a counter example. If it's true then your statement is false.

this sounds like your excuse for not understanding that all explanations are excuses.

WTF? Can you write coherently please.

do his homework"

can you stay on point? the example is when you don't do your homework.

Can you explain how playing dota is an excuse for not doing your homework? If you can't then there's a counter example to your claim.

this might help: http://dictionary.reference.com/browse/counterexample