小伙伴们，公共英语考试大家复习的怎么样了呢？下面是帮考网分享的一些公共英语考试二级部分的语法练习资料，一起来看看吧！

公共英语考试pets2语法练习(5)

用一般过去时代替完成时

1) 两个动作如按顺序发生，又不强调先后，或用then，and，but 等连词时，多用一般过去时。

When she saw the mouse，she screamed.

My aunt gave me a hat and I lost it.

2 ) 两个动作相继发生，可用一般过去时;如第一个动作需要若干时间完成，用过去完成时。

When I heard the news, I was very excited.

3) 叙述历史事实，可不用过去完成时，而只用一般过去时。

Our teacher told us that Columbus discovered America in 1492.

公共英语考试pets2语法练习(6)

过去完成时典型例题

The students ___ busily when Miss Brown went to get a book she ___ in the office.

A. had written, left

B. were writing, has left

C. had written, had left

D. were writing, had left

答案D. "把书忘在办公室"发生在"去取书"这一过去的动作之前，因此"忘了书"这一动作发生在过去的过去，用过去完成时。句中when表示的是时间的一点，表示在"同学们正忙于……"这一背景下，when所引导的动作发生。因此前一句应用过去进行时。

注意：

had no … when 还没等…… 就……

had no sooner… than 刚…… 就……

He had no sooner bought the car than he sold it.

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