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【题目】when, whileas填空。

1________ you meet a word you don't know, look it up in the dictionary.

2The students took notes ________ they listened.

3The teacher came in ________ we were singing in class.

4We must strike ________ the iron is hot.

5I will go to college ________ I grow up.

【答案】

1When

2as

3while

4while

5when

【解析】

1句意:当你遇到一个你不认识的单词时,在字典里查一下。when时候,引导时间状语从句,从句中的动词可以是持续性的,也可以是瞬间性的。这个从句中谓语动词meet是瞬间性动词。

2句意:学生们一边听一边记笔记。as时候,一边一边,表示两个动作同时发生,引导时间状语从句。

3句意:当我们正在课堂上唱歌的时候,老师进来了。while时候,引导时间状语从句,从句中的谓语动词必须是持续性的,从句中常用过去进行时,主句用一般过去时。

4句意:我们必须趁热打铁。while时候,引导时间状语从句,从句中的谓语动词必须是持续性的。

5句意:当我长大的时候,我将会上大学。when时候,引导时间状语从句,从句中的动词可以是持续性的,也可以是瞬间性的。

这个题目考查了引导时间状语从句的连词when, whileas的区别,三者都有“当时候”的意思,区别如下:1. 若主句表示的是一个短暂性动作,从句表示的是一个持续性动作,三者都可用;2. 若主、从句表示两个同时进行的持续性动作,且强调主句表示的动作延续到从句所指的整个时间,通常要用 while;3. 若主从句表示的两个同时进行的动作含有“一边…一边”之意思,通常用 as,例如第2小题;4. 若从句是一个短暂性动作,主句是一个持续性动作,可用 as / when 但不用 while;5.若要表示两个正在发展变化的情况,相当于汉语的“随着”,一般用 as;6. 若主从句所表示的动作不是同时发生,而是有先后顺序时,一般要用 when,例如第5小题。

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