if引导的条件状语从句
1 If he is late this evening ,we won't wait for him.
2 If you go out ,close the window.
3 If you are away,Julia is going to live in our flat.
4 .If you are tired ,you wont/mustn'/can't drive .
无论怎样组合，只要意思通顺，结构正确就可以了。答案不一定是唯一的。
1.he will be late if we don't wait for him.
2.please close the window if you go out
4.you shouldn't drive，if you are tired。
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