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本帖最后由 jilinlin 于 2010-2-2 20:53 编辑
语法之动词的时态笔记
1 一般现在时的用法
表示格言或警句中:注意:此用法如果出现在宾语从句中,即使主句是过去时,从句谓语也要用一般现在时。例:Columbus proved that the earth is round..
2 一般过去时的用法
It is time sb. did sth. "时间已迟了""早该……了"
would (had) rather sb. did sth.表示'宁愿某人做某事'
3 used to / be used to
used to + do:"过去常常"表示过去习惯性的动作或状态,但如今已不存在。
be used to + doing:对……已感到习惯,或"习惯于",to是介词,后需加名词或动名词。
4 一般将来时
be +不定式表将来,按计划或正式安排将发生的事。We are to discuss the report next Saturday.
5 be to和be going to
be to 表示客观安排或受人指示而做某事。
be going to 表示主观的打算或计划。
I am to play football tomorrow afternoon.(客观安排)
I'm going to play football tomorrow afternoon. (主观安排)
6 一般现在时表将来
1) 下列动词:come, go, arrive, leave, start, begin, return的一般现在时表将来。这主要用来表示在时间上已确定或安排好的事情。
2) 在时间或条件句中。When Bill comes (不是will come), ask him to wait for me.
I'll write to you as soon as I arrive there.
3)在动词hope, take care that, make sure that等后。
7 比较过去时与现在完成时
一般过去时的时间状语: yesterday, last week,…ago, in1980, in October, just now, 具体的时间状语;
现在完成时的时间状语: for, since, so far, ever, never, just, yet, till / until, up to now, in past years, always,
不确定的时间状语
8 用于现在完成时的句型
1)It is the first / second time…. that…结构中的从句部分,用现在完成时。
2)This is the… that…结构,that 从句要用现在完成时.
注意:非延续性动词的否定形式可以与表示延续时间的状语连用。即动作不发生的状态是可以持续的。
(错)I have received his letter for a month.
(对)I haven't received his letter for almost a month.
9 延续动词与瞬间动词
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……"
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。
10 过去完成时
1) 用法: a.在told, said, knew, heard, thought等动词后的宾语从句。She said (that) she had never been to Paris.
2). 状语从句: 在过去不同时间发生的两个动作中,发生在先,用过去完成时;发生在后,用一般过去时。
When the police arrived, the thieves had run away.
had no sooner… than刚…… 就…… He had no sooner bought the car than he sold it.
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.
11 一般现在时代替过去时
1 )"书上说","报纸上说"等。The newspaper says that it's going to be cold tomorrow. 报纸上说明天会很冷的。
2) 叙述往事,使其生动。Napoleon's army now advances and the great battle begins.
12 一般现在时代替完成时
1) 有些动词用一般现在时代替完成时:hear, tell, learn, write , understand, forget, know, find , say, remember.
2) 宾语从句中的助动词ought, need, must, dare 时态是不变的。 |
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