2019上半年英语六级语法知识:since的四种用法
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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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