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這個when后用一般現在時還是一般將來時

請看下面這道時態考題：

—When __________ again?

—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】此題應選D。第一句為特殊疑問句(when=何時)，根據句意，應用一般將來時態。 第二句為一個含有條件狀語從句的主從復合句(when=當……的時候)。按語法規則：在時間狀語從句和條件狀語從句中，通常要用一般現在時表示將來意義，而不能直接使用將來時態。請做以下選擇題：

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

此時要特別注意分清：由when和if引導的從句是狀語從句還是賓語從句：

3. 1) I won’t go if it ________ tomorrow. (狀語從句)

2) I don’t know if it ________ tomorrow. (賓語從句)

A. rains                                                   B. will rain

C. is raining                                             D. has rained

答案：1. B 2. A 3. 1)A 2)B