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1. If I buy a new hat, I'll give it to you.
2. If today were Sunday, the pupils could go swimming.
3 .If he had been here, he would have had a lot of fun.
4 .If my brother has enough money, he will buy a new bicycle.
5. If he had had time, he would have read this novel.
6 .If she hadn't missed the bus, she wouldn't have been late.
7 .If Peter studied hard, he could get good marks.
8 .If my sister didn't have a terrible headache , she wouldn't be absent from her class.
9 .If windy had come, we wouldn't have cancelled the meeting.