1. 我們不知道他是否要在會上發言。

誤：We didn’t know whether he is going to speak at the meeting.

正：We didn’t know whether he was going to speak at the meeting.

析：該句主句為過去時，且賓語從句表示從過去某個時間看來將要發生的動作，所以從句要用過去將來時態。

2. 老師問湯姆長大后準備干什么。

誤：The teacher asked Tom what he was going to be when he would grow up.

正：The teacher asked Tom what he was going to be when he grew up.

析：在時間狀語從句中，常用一般過去時表示在過去看來將要發生的動作。

3. 他們說如果下星期天不下雨他們就去農場。

誤：They said that they were going to the farm if it would not rain the next Sunday.

正：They said that they were going to the farm if it didn’t rain the next Sunday.

析：在條件狀語從句中，也常用一般過去時表示在過去看來將要發生的動作。

4. 王林打電話告訴她媽媽，她要買一些書。

誤：Wang Lin rang up to tell her mother that she should buy some books.

正：Wang Lin rang up to tell her mother that she would buy some books.

析：過去將來時可以由"助動詞should/would+動詞原形"構成，但should一般只用于第一人稱。而would可用于各種人稱。

5. 上次我見到你時，你正打算開始乘火車去西藏。

誤：Last time I saw you, you had started to go to Tibet by train.

正：Last time I saw you, you were going to start to go to Tibet by train.

析：last time是一般過去時或過去將來時的顯著標志。

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