题目内容
16．If itrains （rain） tomorrow．I'll have to stay at home．分析 如果明天下雨，我将不得不呆在家里了．
解答 答案：rains
联系语境，根据if的意义在此句中为"如果"，主句用了一般将来时，可知此句为if引导的条件状语从句；其时态遵循"主将从现"；所以从句应该用一般现在时表将来；主语为三单it，结合给出的动词rain，所以此处也应该用rain的三单形式rains．故填：rains
点评 此题考查if条件状语从句的用法．做题时牢牢抓住其时态规则即可做出正确答案．
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