Ann doesn't know you because she doesn't attend the party

1. ann doesn't know you because she doesn't attend the party
-> if
2. tom wasn't on the rain because he didn't like it
-> if
3. "i will be surprised if mary doesn't pass the exam", our teacher said
-> 
4. "you will be surprised if you meet him", peter said to linda
-> 
5. "i'd have given you a lift if you hadn't had your bike with you", my friends said to me
->