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(9)

延续动词与瞬间动词

1)用于完成时的区别

延续动词表示经验、经历; 瞬间动词表示行为的结 果，不能与表示段的时间状语连用。

He has completed the work. 他已完成了那项工作。 (表结果)

I\'ve known him since then. 我从那时起就认识他了。(表经历)

2)用于till/until从句的差异

延续动词用于肯定句，表示"做……直到……" 瞬间动词用于否定句，表示"到……，才……"

He didn\'t come back until ten o\'clock.

他到10 点才回来。

He slept until ten o\'clock.

他一直睡到10点。

典型例题

1. You don\'t need to describe her. I ___ her several times.

A. had met B. have met C. met D. meet

答案B. 首先本题后句强调对现在的影响，我知道她的模样，你不用描述。再次，several times告知为反复发生的动作，因此用现在完成时。

2.——I\\'m sorry to keep you waiting.

——Oh, not at all. I ___ here only a few minutes.

A. have been B. had been C. was D. will be

答案A. 等待的动作由过去开始，持续到现在，应用现在完成时。

公共英语考试pets2语法练习(10)

比较since和for

Since 用来说明动作起始时间，for用来说明动作延续时间长度。

I have lived here for more than twenty years.

I have lived here since I was born……

My aunt has worked in a clinic since 1949.

Some new oilfields have been opened up since 1976.

I have known Xiao Li since she was a little girl.

My brother has been in the Youth League for two years.

I have not heard from my uncle for a long time.

注意：并非有for 作为时间状语的句子都用现在完成时。

I worked here for more than twenty years.

(我现在已不在这里工作。)

I have worked here for many years.

(现在我仍在这里工作。)

小窍门：当现在完成时+一段时间，这一结构中，我们用下面的公式转化，很容易就能排除非延续动词在完成时中的误使。

1) (对) Tom has studied Russian for three years.

= Tom began to study Russian three years ago, and is still studying it now.

2) (错) Harry has got married for six years.

= Harry began to get married six years ago, and is still getting married now.

显然，第二句不对，它应改为 Harry got married six years ago. 或 Harry has been married for six years.

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