英语时态语法一般将来时,现在时,过去时,现在进行式的用法,结构,时间判断短语各市什么?第三人称单数形势,三单过去分词,一

英语时态语法
一般将来时,现在时,过去时,现在进行式的用法,结构,时间判断短语各市什么?
第三人称单数形势,三单过去分词,一般现在时,一般过去时时的构成规则是什么?

一般将来时
1) shall用于第一人称,常被will 所代替.
will 在陈述句中用于各人称,在争求意见时常用于第二人称.
Which paragraph shall I read first.
Will you be at home at seven this evening?
2) be going to +不定式,表示将来.
a. 主语的意图,即将做某事.
What are you going to do tomorrow?
b. 计划,安排要发生的事.
The play is going to be produced next month.
c. 有迹象要发生的事
Look at the dark clouds, there is going to be a storm.
3) 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.
4) be about to +不定式,意为马上做某事.
He is about to leave for Beijing.
注意：be about to 不能与tomorrow, next week 等表示明确将来时的时间状语连用.
一般现在时
1) 经常性或习惯性的动作,常与表示频腮度的时间状语连用.
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. 骄者必败.
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.
Ann Wang writes good English but does not speak well.
比较：Now I put the sugar in the cup.
I am doing my homework now.
第一句用一般现在时,用于操作演示或指导说明的示范性动作,表示言行的瞬间动作.再如：Now watch me, I switch on the current and stand back. 第二句中的now是进行时的标志,表示正在进行的动作的客观状况,所以后句用一般现在时.
现在完成时
现在完成时用来表示之前已发生或完成的动作或状态,其结果的确和现在有联系.动作或状态发生在过去但它的影响现在还存在；也可表示持续到现在的动作或状态.其构成： have (has) +过去分词.
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.
It is the first time that I have visited the city.
It was the third time that the boy had been late.
2）This is the… that…结构,that 从句要用现在完成时.
This is the best film that I've (ever) seen.
这是我看过的最好的电影.
This is the first time (that) I've heard him sing. 这是我第一次听他唱歌.
典型例题
(1) ---Do you know our town at all?
---No, this is the first time I ___ here.
A. was B. have been C. came D. am coming
答案B. This is the first time 后面所加从句应为现在完成时,故选B.
(2) ---Have you ____ been to our town before?
---No, it's the first time I ___ here.
A. even, come B. even, have come C. ever, come D. ever, have come
答案D. ever意为曾经或无论何时,反意词为never,此两词常用于完成时. This is the largest fish I have ever seen. It is / was the first time +that-clause 的句型中,从句要用完成时.
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.
一般过去时
1）在确定的过去时间里所发生的动作或存在的状态.
时间状语有：yesterday, last week, an hour ago, the other day, in 1982等.
Where did you go just now?
2）表示在过去一段时间内,经常性或习惯性的动作.
When I was a child, I often played football in the street.
Whenever the Browns went during their visit, they were given a warm welcome.
3）句型：
It is time for sb. to do sth "到……时间了" "该……了"
It is time sb. did sth. "时间已迟了" "早该……了"
It is time for you to go to bed. 你该睡觉了.
It is time you went to bed. 你早该睡觉了.
would (had) rather sb. did sth. 表示'宁愿某人做某事'
I'd rather you came tomorrow.
4) wish, wonder, think, hope 等用过去时,作试探性的询问、请求、建议等.
I thought you might have some. 我以为你想要一些.
比较：
一般过去时表示的动作或状态都已成为过去,现已不复存在.
Christine was an invalid all her life.
(含义：她已不在人间.)
Christine has been an invalid all her life.
(含义：她现在还活着)
Mrs. Darby lived in Kentucky for seven years.
(含义：达比太太已不再住在肯塔基州.)
Mrs. Darby has lived in Kentucky for seven years.
( 含义：现在还住在肯塔基州,有可能指刚离去)

注意： 用过去时表示现在,表示委婉语气.
1）动词want, hope, wonder, think, intend 等.
Did you want anything else?
I wondered if you could help me.
2）情态动词 could, would.
Could you lend me your bike?
比较过去时与现在完成时

1）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.

2）过去时常与具体的时间状语连用,而现在完成时通常与模糊的时间状语连用,或无时间状语.
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
共同的时间状语:
this morning, tonight,this April, now, once,before, already, recently,lately
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

3）现在完成时可表示持续到现在的动作或状态,动词一般是延续性的,如live, teach, learn, work, study, know.
过去时常用的非持续性动词有come, go, leave, start, die, finish, become, get married等.
举例：
I saw this film yesterday.
（强调看的动作发生过了.）
I have seen this film.
（强调对现在的影响,电影的内容已经知道了.）
Why did you get up so early?
（强调起床的动作已发生过了.）
Who hasn't handed in his paper?
（强调有卷子,可能为不公平竞争.）
She has returned from Paris.
她已从巴黎回来了.
She returned yesterday.
她是昨天回来了.
He has been in the League for three years.
(在团内的状态可延续)
He has been a League member for three years.
(是团员的状态可持续)
He joined the League three years ago.
( 三年前入团,joined为短暂行为.)
I have finished my homework now.

---Will somebody go and get Dr. White?
---He's already been sent for.
句子中如有过去时的时间副词（如 yesterday, last, week, in 1960）时,不能使用现在完成时,要用过去时.
（错）Tom has written a letter to his parents last night.
（对）Tom wrote a letter to his parents last night.