题目内容
12．-The football match is coming．I'm not sure if it will rain tomorrow．-If it ，we'll put off the match．（ ）
| A． | will rain | B． | is raining | C． | rains | D． | rain |
分析 ---足球赛快到了，我不确定明天是否会下雨．
---如果下雨，我们就推迟比赛．
解答 答案：C．第二个if引导的是条件状语从句，遵循主将从现的规则，从句主语it，故rains，故答案是C．
点评 if引导的是条件状语从句1、主将从现 （主句为一般将来时，从句为一般现在时）；
eg：If it rains（从句），I will stay at home（主句）．
=I will stay at home if it rains．
2、主句含有情态动词 （must、may、can etc．）从句为一般现在时；
eg：If you drive too fast，you may have an accident．
=You may have an accident if you drive too fast
3、主句为祈使句，从句要用一般现在时态；
eg：Don't play computer games if you don't finish your homework．
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