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2019上半年英语六级语法知识:since的四种用法

发布时间:2021-02-03 栏目:阅读 投稿:威武的云朵

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英语六级语法知识:since的四种用法

1) since +过去一个时间点(如具体的年、月、日期、钟点、1980, last month, half past six)。

I have been here since 1989.

2) since +一段时间+ ago

I have been here since five months ago.

3) since +从句

Great changes have taken place since you left.

Considerable time has elapsed since we have been here.

4) It is +一段时间+ since从句

It is two years since I became a postgraduate student.

英语六级语法知识:一般现在时代替完成时

1) 表示即将发生的或预定中计划好的活动。

Are you staying with us this weekend? 这周和我们一起度周末吗?

We are leaving soon. 我们马上就走。

2) 渐变动词,如:get, run, grow, become, begin及die。

He is dying.

英语六级语法知识: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 metB. have met C. metD. 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. wasD. 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

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