1) If that house (to collapse), many people would be killed.
2) He (to walk) if the train is too late.
3) The customs officer (to find) a bottle of whisky if he had searched my bag.
4) Will you phone me if there (to be) any problem ?
5) If you drove more carefully, you (not to have) so many accidents.
6) If I had known how expensive this car was, I (not to hire) it.
7) He will see interesting old buildings if he (to visit) oxford.
8) The children (to be) better swimmers if they swam more frequently.
9) If I (to be) you, I wouldn’t worry about going to university.
10) I wouldn’t mind having children if we (to live) in the country.