1)If I ........(know) the answer,I ........(not tell) you!
2)If a friend.........(do) something wrong,......(you/tell) anyone?
3)I .........(be) really surprised if Danny .........(break) his promise.He's a very loyal person.
4)If you .......(not be) so secretive,perhaps we ........ (be able to)help you.
Пример:If I found (find) someone's wallet,I'd probably take (probably take) it to the police station.