题目内容
16．I don't know if it _________tomorrow．If it ______，I'll go out for picnic．（ ）| A． | will rain，doesn't rain | B． | rains，won't rain | ||
| C． | rains，isn't rain | D． | will rain，will rain |
分析 我不知道明天是否会下雨．如果不下雨，我就会出去野餐．
解答 答案：A．第一个if表示是否，引导宾语从句，主句是一般现在时，从句时态不受限制，tomorrow明天，故用一般现在时will+动词原形，第二个if表示如果，引导的条件状语从句，遵循主将从现的规则，从句主语it三单，故借助于助动词does加上not构成否定，后加原形rain，故答案是A．
点评 1．（表示条件）如果，主句用将来时，if从句用现在时表示将来
He will come if you invite him．
如果你请他，他会来的．
2．是否=whether 连接宾语从句
I wonder if she is ill．
不知她是否病了．
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