(1)一般现在时的基本用法
1) 经常性或习惯性的动作,常与表示频度的时间状语连用.
时间状语: every…, sometimes, at…, on Sunday
I leave home for school at 7 every morning.
2) 客观真理,客观存在,科学事实.
The earth moves around the sun.
Shanghai lies in the east of China.
3) 表示格言或警句中.
Pride goes before a fall.
【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..
4) 现在时刻的状态、能力、性格、个性.
I don't want so much.
5) 某些动词如 come, go, move, stop, leave, arrive, be, finish, continue, start 等,在一般现在时句中可用来表示将来肯定会发生的动作.
The train comes at 3 o'clock.
6) 在时间状语从句或条件状语从句中,一般现在时代替一般将来时.
I'll help you as soon as you have problem.
Tell Xiao Li about it if you meet him.
(2)一般过去时的用法:
表示过去某一时刻或某一段时间内所发生的动作或情况,通常一般过去式带有表示动作时间状语的词,词组或从句,如 yesterday, the day before last, last week, two days ago 等,上下文清楚时可以不带时间状语.
I worked in that factory last year.
【注意】
1) 过去经常反复发生的动作,也可用used to或would加动词原形来表达,例如:
I used to go fishing on Sundays.
2) “used to”也可用于表示过去曾经存在过的状态.例如:
This river used to be clean.
(3)一般将来时的用法
1)表示将来的动作或状态.例如:
I shall attend the meeting tomorrow.
2)表示将来反复发生的动作或存在的状态.例如:
He will go to see his mother every Saturdays.
3)表示将来的意愿,决心,许诺, 命令等时常用will,征求对方意见,主语是第一人称时,常用shall.
I will do my best to catch up with them.
Shall I open the door?
4)be + going + 动词不定式.也是一种将来时句型,表示打算,计划,最近
或将来要作的某事.
I am going to Beijing next week.
5)be + 动词不定式.表示有职责,义务,可能,约定,意图等.
There is to be a meeting this afternoon.
We are to meet the guests at the station.
6)be about + 动词不定式,表示马上,很快作某事.
They are about to leave.
(4)现在进行时的用法
1) 现在进行时的用法表示说话者说话时正在发生或者进行的动作, 它注重
现在正在进行的动作,而不管动作从什么时间开始,到什么时间结束.
What are you doing now?
I am looking for my key.
2) 现在进行时表示目前一段时间内正在进行的动作(但说话时这个动作不一定在进行).
The students are preparing for the examination.
3) 某些动词的现在进行时可以表示即将发生的动作,这些动词有 arrive, come, leave, start等.
They are going to Hong Kong tomorrow.
【注意】有些动词一般不可以用于进行时态
①表示状态的动词,尤其是静态动词,如:be, have
②表示认识、知觉和情感的动词,如:know, think, hear, find, see, like, want, wish, prefer等.
(5)现在完成时的用法
1) 现在完成时表示在说话之前已经完成或刚完成的动作.
I have bought a ten-speed bicycle.
They have cleaned the classroom.
2) 现在完成时表示动作从过去开始持续到现在,或者还有可能持续下去的动作或状态. 现在完成时常与for 和 since 引导的短语或从句连用.
We have lived here since 1976.
They have waited for more than two hours.
【注意】
一般过去时与现在完成时的区别
过去时表示过去某时发生的动作或单纯叙述过去的事情,强调动作;现在完成时为过去发生的,强调过去的事情对现在的影响,强调的是影响;一般过去时常与具体的时间状语连用.
试比较:
I saw this film yesterday.(强调看的动作发生过了,不涉及现在)
I have seen this film. (强调对现在的影响,电影的内容已经知道了.)
(6)过去进行时的用法
表示过去某时正在进行的状态或动作.例如:
I was watching TV when she came to see me.
【注意】
过去进行时和一般过去时都是过去发生的事情,但过去进行时侧重表示过去某一时刻正在进行的动作或所处的状态,强调动作的连续进行,而一般过去时则表示单纯的过去事实,例如:
They were building a house last month. (上个月正在建造,建造好与否不知)
They built a new house last month. (上个月建造好了,动作已经完成)
(7)过去完成时的用法
过去完成时表示过去某一时刻或某一动作之前完成的动作或所处的状态,过去完成时常和 by , before 等词组成的短语和从句连用.
We had already learned two thousands words by the end of last year.
When we arrived at the station, they had waited for more than twenty minutes.
(8)过去将来时的用法
过去将来时表示从过去某个时间看将要发生的动作或存在地状态,过去将来时较多地被运用在宾语从句中.例如:
They were going to have a meeting.
I told him that I would see him off at the station.