英语时态结构和用法讲解学习.docx
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英语时态结构和用法讲解学习
英语时态结构和用法
英语时态结构和用法
英语的时态(tense)j是一种动词形式,不同的时态用以表示不同的时间与方式。
下面就英语中常见的八种基本时态进行阐述,其它的时态都是在这八种时态的基础上结合而成的。
一、 一般现在时:
1.概念:
经常,反复发生的动作或行为及现在的某时间状语
:
always, usually, often, sometimes, every week (day, year, month…), once a week, on Sundays
3.基本结构:
动词 原形 (如主语为第三人称单数,动词上要加(e)S)
4.否定形式:
am/is/are+not;此时态的谓语动词若为行为动词,则在其前加don't,如主语为第三人称单数,则用doesn't,同时还原行为动词。
5.一般疑问句:
把be动词放于句首;用助动词do提问,如主语为第三人称单数,则用does,同时,还原行为动词。
6.例句:
. It seldom snows here.
He is always ready to help others.
Action speaks louder than words.
二、 一般过去时:
1.概念:
过去某个时间里发生的动作或状态;过去习惯性、经常性的动作、行为。
时间状语:
ago, yesterday, the day before yesterday, last week(year, night, month…), in 1989, just now, at the age of 5, one day, long long ago, once upon a time, etc.
3.基本结构:
be动词;行为动词
4.否定形式:
was/were+not;在行为动词前加didn't,同时还原行为动词。
5.一般疑问句:
was或were放于句首;用助动词do的过去式did 提问,同时还原行为动词
6.例句:
She often came to help us in those days.
I didn't know you were so busy.
三、 现在进行时:
1.概念:
表示现阶段或说话时正在进行的动作及行为。
2.时间状语:
now, at this time, these days, etc.
3.基本结构:
am/is/are+doing
4.否定形式:
am/is/are+not+doing.
5.一般疑问句:
把be动词放于句首。
6.例句:
How are you feeling today?
He is doing well in his lessons.
四、 过去进行时:
1.概念:
表示过去某段时间或某一时刻正在发生或进行的行为或动作。
2.时间状语:
at this time yesterday, at that time或以when引导的谓语动词是一般过去时的时间状语等。
3.基本结构:
was/were+doing
4.否定形式:
was/were + not + doing.
5.一般疑问句:
把was或were放于句首。
6.例句:
At that time she was working in a PLA unit.
When he came in, I was reading a newspaper
五、 现在完成时:
1.概念:
过去发生或已经完成的动作对现在造成的影响或结果,或从过去已经开始,持续到现在的动作或状态。
2.时间状语:
recently, lately, since…for…,in the past few years, etc.
3.基本结构:
have/has + done
4.否定形式:
have/has + not +d one.
5.一般疑问句:
have或has。
6.例句:
I've written an article.
It has been raining these days.
六、 过去完成时:
1.概念:
以过去某个时间为标准,在此以前发生的动作或行为,或在过去某动作之前完成的行为,即“过去的过去”。
2.时间状语:
before, by the end of last year(term, month…),etc.
3.基本结构:
had + done.
4.否定形式:
had + not + done.
5.一般疑问句:
had放于句首。
6.例句:
As soon as we got to the station, the train had left.
By the end of last month. We had reviewed four books
七、 一般将来时:
1.概念:
表示将要发生的动作或存在的状态及打算、计划或准备做某事。
2时间状语tomorrow, next day(week, month, year…),soon, in a few minutes, by…,the day after tomorrow, etc.
3.基本结构:
am/is/are/going to + do;will/shall + do.
4.否定形式:
was/were + not; 在行为动词前加didn't,同时还原行为动词。
5.一般疑问句:
be放于句首;will/shall提到句首。
八、 过去将来时:
1.概念:
立足于过去某一时刻,从过去看将来,常用于宾语从句中。
2.时间状语:
the next day(morning, year…),the following month(week…),etc.
3.基本结构:
was/were/going to + do;would/should + do.
4.否定形式:
was/were/not + going to + do;would/should + not + do.
5.一般疑问句:
was或were放于句首;would/should 提到句首。
6.例句:
He said he would go to Beijing the next day.
I asked who was going there .
几种常见时态的相互转换
英语中的几种时态在一定情况下可以互相转换,以下是几种常见的转换形式:
一、 一般过去时与现在完成时的转换
在现在完成时中,延续性动词能与表示一段时间的状语连用,瞬间动词却不能。
但是,可用别的表达方式:
①瞬间动词用于“一段时间 + ago”的一般过去时的句型中;②瞬间动词可改成与之相对应的延续性动词及短语,与一段时间连用;③瞬间动词用于“It is + 一段时间 + since + 一般过去时”的句型中,表示“自从……以来有……时间”的意思,主句一般用it is来代替It has been;④瞬间动词用于“Some time has passed since + 一般过去时”的句型中。
请看:
A. He joined the League two years ago.
B. He has been in the League for two years.
C. It is two years since he joined the League.
D. Two years has passed since he joined the League.
二、 一般现在时与现在进行时的转换
在一般现在时中,at加上名词表示“处于某种状态”,如at work(在工作), at school(上学、上课)等。
此短语可与进行时态转换。
请看:
Peter is at work, but Mike is at play.
Peter is working, but Mike is playing.
三、 现在进行时与一般将来时的转换
在现在进行时态中go, come, leave, start, arrive等动词常与表示将来的时间状语连用表示将要发生的动作。
如:
I am coming, Mum!
意为“我就来,妈妈!
”请看:
The train is leaving soon.
The train will leave soon.
四、“be going to+动词原形”与“will(shall)+动词原形”结构的转换
“be going to+动词原形”、表示打算、计划要做的事;将来时“will(shall)+动词原形”结构在书面语中,当主语为第一人称时,常用助动词shall。
在口语中,所有人称都可以用will。
请看:
We are going to visit the Great Wall next Sunday.
We shall visit the Great Wall next Sunday.
英语从句大全
宾语从句:
,
定义:
宾语从句是指在复合句中做及物动词的宾语的从句,也
可以作介词和某些形容词的宾语。
宾语从句一般用于及物动词之后,或用于介词之后。
2,
表现形式:
A 及物动词后的宾语从句
(1)有从属连词引导
I think (that) watching TV too much is bad for people’s health. 我认为看太多电视对身体有害。
Recent court decisions have ordered that public schools take the necessary steps to provide that education.
最近的法院裁决责令公立学校采取必要步骤提供那种教育。
I don’t know if other clients are going to abandon me,too. 我不知道其他顾客是否也会抛弃我。
(2)有连接代词引导
This test is intended to reinforce what you have learnt in the past few weeks.
这次考试的目的在于巩固你们在过去几周所学的知识。
You may never find out who dealt with the complaint later. 过后你可能无法知道谁处理的投诉。
It is your task to find out into which of the two kinds of jobs you fit.
你的任务是搞清楚,这两种工作你适合哪种。
(3)有连接副词引导
There are still no forecasts for when faster-than-light travel will be available.
对于超光速旅行何时能实现,目前还没有做出预料。
We can’t understand why he avoided speaking to us. 我们不理解他为什么不跟我们说话。
They know exactly where they are going. 他们清楚地知道自己的行动方向。
We need to understand how the normal cell controls itself. (how表示方式)
我们需要了解正常细胞是如何自我控制的。
We do not know how far mankind will be able to solve these problems.(how表示程度)
我们不知道人类能够把这些问题解决到什么程度。
特别提示:
如果主句谓语是think,believe,suppose,imagine 等,宾语从句中的否定意义通常在主句中表现出来,称为“否定转移”。
例如:
I don’t think this is the best way. 我认为这不是最佳方法。
当宾语从句作介词的宾语时,不能用if引导,而只能用whether. Our basic difference of opinion concerns the question of whether or not the city as such to be preserved.
一个基本的意见分歧涉及的问题是,像目前这样的城市是否还要保留下去。
B 介词和某些形容词之后的宾语从句
(1)介词后的宾语从句
He only laughed at what I said. 对我的话他只是笑。
I always think of how I can improve my spoken English. 我经常考虑如何才能提高我的英语口语。
(2)某些形容词后的宾语从句 I’m afraid that I can’t go with you. 我恐怕不能和你们一起去了。
I am sure that they will make greater progress in English through hard work.
我确信,通过艰苦努力他们将在英语方面取得更大的进步。
(3)非谓语动词之后的宾语从句
Reading that it was just a difference in custom, the foreigner smiled and said nothing.
这个外国人知道了这只是风俗的不同后,就笑了笑,没说什么。
On being asked whether he had any good food in Germany, he answered ”Terrible”.
一问到他在德国是否吃过什么好菜,他就回答说:
“糟糕的很”。
(4) 用it作形式宾语的宾语从句
常见的表达包括:
have it that (说);insist on(或upon)it that (坚决主张,坚决要求);make it clear that(表明);see to that (确保);take it that (认为);等等。
I insist upon it that we should be honest. 我坚决主张我们应该诚实。
I take it that you don’t want to do it ,but you have to. 我认为你不想做这件事,但你必须要做,。
The rapid development of laser techniques in the past ten years has made it clear that the future is likely to be very exciting.
过去十年激光技术的迅速发展已经表明,未来可能是令人鼓舞的。
Rumor has it that more than 20books on creationism and evolution are in the publisher’s pipeline.
传闻说,有20多本关于神造说与进化论之争的书籍正在出版。
(in the publisher’s pipeline.在进行中,在生产中)
There are those who consider it questionable that these defense-linked research projects will account for an improvement in the standard of living or, alternately, do much to protect our diminishing resources. 有些人认为这些国防研究项目将带来生活水平的改善,或者对保护我们日益减少的资源做出重大贡献是值得怀疑的
表语从句:
1,
定义:
表语从句是指在复合句中做主句表语的从句。
表语从句
和主语只同一内容,它对主语进行解释、说明,是主语的内容具体化。
2,
表现形式:
A 由从属连词引导
The clear message is that we should get moving to protect ourselves. 译:
传达的信息一清二楚:
我们应该行动起来保护我们自己。
The reason I didn’t go to France was that I got a new job. 译:
我之所以没去法国是因为我找到一份新工作。
特别提示:
下列表达式不规范的:
The reason I didn’t go to France was because I got a new job .因为because 不能引导名词性从句。
The question is whether he works at all. 译:
问题在于他是否工作。
特别提示:
下列表达是错误的:
The question is if he works at all .因为if不能引导表语从句。
B 有连接代词引导
China is not what it used to be . 译:
中国不再是过去的样子了。
Raw material is what we are badly in need of . 原材料是我们急需的。
C 有连接副词引导
The next important question we have to decide is when we have to submit the annual report.
我们必须决定的下一个问题是,是么时候我们必须呈交年度报告。
Some people maintain that this is precisely where the danger lies. 有些人坚持认为这恰恰是危险所在。
This is why I didn’t pass the exam. 这就是我考试不及格的原因。
D A is to B what C is to D 这是一种涉及表语从句特殊形式的句型,所表达的基本意义为“A之于B 正如C之于D”。
前后进行类比,通过说明C 对于D 的重要性,目的在于突出A对于B 的重要性。
The pen is to a writer what the gun is to a soldier. 笔对于作家正如枪对于士兵。
Air is to us what water is to fish. 空气对于我们正如同水对于鱼儿。
Reading is to the mind what food is to body. 读书对于思想就如同食物对于身体。
主语从句:
1, 定义,主语从句是指在复合句中做主句主语的从句。
2,
表现形式:
A 由从属连词(that whether if )引导 That the plates are moving is beyond dispute. 译:
板块在运动,这是无可置疑的。
特别提示:
不能这样表达:
The plates are moving is beyond dispute. 尽管that没有实际含义,但它起到引导主句的功能,在这里不可或缺,否则句子结构会出现混乱。
That our environment has little, if anything ,to do with our abilities ,characteristics and behavior is central to that theory . 译:
这种理论的核心是,我们的环境同我们的才能,性格特征和行为即使有什么关系的话,也是微不足道的。
Whether she will come or not is still a question . 译:
她是否来仍然是个疑问。
Whether the results will be valuable ,meaningless ,or even misleading depends partly upon the tool itself but largely upon the user . 译:
结果究竟是有价值的,还是无意义的,甚至是误导的,这在部分程度上取决于工具本身,但在很大程度上取决于使用者。
特别提示,whether 引导的主语从句位于句首时,不能有if 代替。
B 由连词代词引导
Who will go to the energy conference is not important. (疑问分句作主语)
谁将去参加能源会议并不重要。
What he wanted to see was an end to all the armies of the world . 他想看到的是世界上一切军队的消亡。
C 由连词副词引导
How he manages to finish the job is of interest to us all. 他如何设法完成这项工作的,我们对此都很感兴趣。
Why he failed the English exam wasn’t clear. 还不清楚他为什么没有通过英语考试。
When they will leave for Beijing is not yet decided. 他们什么时候动身去北京还未确定。
D 用it 作形式主语
由于主语从句位于句首会使句子显得头重脚轻,一次常把它移到
句子的后部,句首用引导词it 来做形式主语。
It is our hope that the two sides will work towards peace. 我们希望双方朝着和平的方向努力。
It doesn’t matter whether Mary comes to party or not. 玛丽是否来参加聚会是没有多大关系。
特别提示:
当whether引导主语从句位于句尾时,whether可以有
if 代替,但if 通常不能与or not 搭配,如本句也可以表达为It doesn’t matter much if Mary comes to partornot
It makes no difference what you read or study if you can’t remember
it
如果你记不住,那么你读什么或者学什么都不重要了。
E 两个从句共同做主语
Whether such a sense of fairness evolved independently in
capuchins and humans ,or whether it stems from the common ancestor that the species had 35 million years ago ,is ,as yet ,an unanswered question .
译:
这种公平意识是在卷尾猴和人类身上各自独立发展而来,还
是起源于两个物种在