请看下面这道时态考题： —When __________ again?http://yingyu.chazidian.com —I don’t know. But when he __________，I’ll let you know. A. he comes，comes B. will he come，will come C. he comes，will come D. will he come，comes 【分析】此题应选D。第一句为特殊疑问句(when=何时)，根据句意，应用一般将来时态。 第二句为一个含有条件状语从句的主从复合句(when=当……的时候)。按语法规则：在时间状语从句和条件状语从句中，通常要用一般现在时表示将来意义，而不能直接使用将来时态。请做以下选择题： 1. The football match will be put off if it ________. A. will rain B. rains C. rained D. is raining 2. —Can I join your club，Dad? —You can when you _________ a bit older. A. get B. will get C. are getting D. will have got 此时要特别注意分清：由when和if引导的从句是状语从句还是宾语从句： 3. 1) I won’t go if it ________ tomorrow. (状语从句) 2) I don’t know if it ________ tomorrow. (宾语从句) A. rains B. will rain C. is raining D. has rained 答案：1. B 2. A 3. 1)A 2)B