Which are examples of complex sentences? Check all that apply.

1. I love all kinds of seafood, but shrimp is my favorite.
2. Before you eat the sandwich, please cut it in half.
3. Carl needs to find his cell phone, or he may borrow mine.
4. When we are ready to leave, we will send you a text message.
5. If she starts to get warm, Janna will turn on the air conditioner.