Here are the correct forms of the verbs for the sentences:
If we finish band practice on time tonight, I’ll meet you for sushi.
If we don’t have school tomorrow, I will go cross-country skiing with my brother. Unfortunately, it's Wednesday, and we do have school.
I wouldn't buy that model of phone if I were you. My sister has one and she hates it.
OK, OK, you can borrow my bike, but if I lend it to you, will you ride safely?
If everybody looked the same, we would get tired of looking at each other.
If you eat nothing but junk food, you will feel tired all the time. You should change your diet.
Feel free to ask if you have anymore questions or need further explanations!