Ответ:
1.If they (were looking / had looked) at the map before they left, they wouldn’t have got lost.
2.If they ( eat / are eating) dinner, I won’t disturb them.
3.If Sue has invited us to her party, we (should buy / buy) her a gift.
4.If I don’t feel well tomorrow, I (couldn’t / won’t) go to work.
5.If the car alarm (goes off / is going off), press the button on my keyring to stop it.
6.I wonder if she (is remembering / will remember) to post the letter.
7. If the mayor (should / would) call, tell him I’m busy.
8. If you (don’t / haven’t) finish your homework, you can’t watch your favourite programme.
9.If it (is raining / rains) when you leave, take an umbrella.
10.If you (will wait / are waiting), I’ll see if the doctor can see you.
11.If Sam (has laid / is laying) the table, I can serve dinner.
12.Does water turn into ice when it (will freeze / freezes)?
13.If you (will behave / behave) yourself, dad may take you to the park.
14.If he (will finish / finishes) work early, he may go to the theatre.
15.If I (went / would go) to bed earlier, I wouldn’t be late for work so often.