题目内容
12．I want to know if it ______ tomorrow．If it _______，we will go hiking．（ ）| A． | rains； rains | B． | will rain； won't rain | ||
| C． | will rain； doesn't rain | D． | rains； won't rain |
分析 我想知道明天是否会下雨，如果不下雨我们就会去远足．
解答 答案：C．
第一个if引导的是宾语从句，表示"是否"，主句是一般现在时，从句时态不受限制，tomorrow明天，表达的是将来的事情用一般将来时will+动词原形，第二个if表示"如果"，引导的是条件状语从句，遵循主将从现的规则，结合句意可知是说如果不下雨我们就会去远足，故用一般现在时的否定句，it三单，故借助于does构成否定，故答案是C．
点评 if 如果，引导条件状语从句，当主句是一般将来时，if引导的从句要用一般现在时，如：If it doesn't rain tomorrow，I will go to the zoo．如果明天不下雨，我要去动物园
if 是否，引导宾语从句，不受世态的限制，所以可以用一般将来时，如：I don't know if he will visit his grandparents．我不知道他是否会去拜访他的祖父母
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