急求英语8种时态定义,标志性词,3个例句一般现在时,一般过去时,一般将来时,过去将来时,过去进行时,过去完成时,现在进行时,现在完成时定义 标志性词 3个例句

（一）一般现在时.（do/does, am/is/are, 情态动词）
一般现在时表示的是客观事实或平时反复做的事情通常有频率副词always,usually,often,sometimes,seldom,once a week,every day等.
如：The earth goes around the sun.
Japan lies east of China.
He is never late for school.
He often gets up at six every day.
Cats can climb trees.
I hear they have moved into a new house.
He writes to his father once a year.
一般现在时还可以表示、安排好的,或即将发生的事,通常使用瞬间动词come,start,begin,return,leave等.
如：My plane leaves at 6:00 a.m..
Is there any meeting today?
The game starts at 8:00.
（二）现在进行时.（am/is/are doing）
现在进行时表示现在或最近正在做的事情,后面一般接延续性的动词,都表示动作没有进行完.
如：Look! The boy is dancing.
He is watching a football game.
What are you doing now?
They are preparing for the exam recently.
还常与always,usually,constantly,forever,continually等词连用表示一种语气,“总是,老是…”,
如：He is always working late.
Why are you always making this kind of mistake?
He is continually getting into trouble with the police.
后面接暂转动词时表示正在反复的动作,或表示将来时（一般只有go, come, leave和have）
如：The monkeys are jumping.
They are hitting the tree.
表将来：We are going swimming this afternoon.
They are leaving here.
They are having an English class tomorrow.
试比较：
He is doing his homework until his parents come to take him home.
He will do his homework until his parents come to take him home.
注：表示知觉、感觉、看法、认识、情感或愿望的动词和大部分暂转动词不能用现在进行时,如：see, hear, smell, taste, feel, like, hate, dislike, want, love, hate, want, know, forget, remember, understand, believe, suppose, mean, wish, hope, need, believe, refuse, suppose, have, fit, seem, fear, own等
（三）现在完成时
现在完成时中用瞬间动词表示说话时已经完成的动作,而且这个动作对现在还有影响,句中的时间副词主要有already, yet, now, by this time, by now等；用延续动词表示过去已经开始持续到现在而且还有可能继续持续下去的动作,句中的时间副词主要有this week, in the past/last/recent few years, since…, for….
如：He has already finished his homework.
He hasn’t arrived here yet.
They have been here for ten years.
He has waited here since he came.
与一般过去时比较,看下面一段对话：
A: Have you seen my book? I think I have lost it.
B: Yes, I ______ (see) it on your table just now. But it ______(not be) there any longer. Where and when ______ you ______(lose) it?
A: I think I ______ (lose) it yesterday.
B: ______ you ______ (find) it?
A: ______.(Yes./No.)
现在完成时中的瞬间动词与延续动词的相互转化：
have finished/stopped/ended → have been over
have started/begun → have been on
have joined → have been in/a member of
have turned/become/got → have been
have left → have been away from
have arrived/reached/got to → have been
have died → have been dead
have married/got married to sb. → have been married to sb.
（四）一般将来时.（will/shall do, am/is/are going to do, am/is/are doing, am/is/are about to do）
一般将来时表示将要发生或打算做的事情,
如：He will come back in two days.
When will he give the book back to me?
It’s going to rain.
We are going to hold a sports meeting next week.
They are leaving for New York.
He is about to leave.
（五）一般过去时.（did, was/were, 情态动词过去式）
一般过去时表示在过去的某个时间发生的具体事情,一般都要有表示过去的时间状语,
如：He went to school by bike yesterday.
We had a good time last night.
He could count to 1000 when he was three.
He was a teacher before.
注意：在直接引语转换成间接引语时时间状语的变化：
如：He said, “I did it yesterday.”
→ He said he did it the day before.
today → that day
yesterday → the/a/one day before
the day before yesterday → 2 days before
last week → the week before
2 weeks ago → 2 week before
tomorrow → the next day/the day after或one/a day later
the day after tomorrow → 2 days after/later
in a week/next week → the next week
in 2 weeks → 2 weeks after/later
（六）过去进行时.（was/were doing）
过去进行时表示在过去的某个具体时间里正在发生的事情,
如：He was reading newspaper at seven yesterday evening.
The Smiths are watching TV at nine last night.
When he got home, his mother was cooking.
或过去的某段时间里持续发生的事情,
如：I was studying English in London from 1990 to 1992.
He was washing the dishes from seven o’clock to seven thirty.
（七）过去完成时
表示在过去的一个动作之前就已经完成的动作,即过去之过去.注意与现在完成时不同的是过去完成时必须要有具体的时间状语.
如：The train had left before she got to the station.
They had learnt 2000 words by the end of last month.
He had been a doctor for 3 years before he came here.
He got back the book that he had left in the classroom.
No sooner had he got to the cinema than the film began.
Hardly had he got to the cinema when the film began.
注意：如果两个或几个动作连续发生且衔接紧密时用一连串的一般过去式即可.
如：He locked the door and went away.
Mr.Smith went to the market, bought some flowers and went to see his friends.
He sent a telegraph home before he left Paris.
（八）过去将来时.（would/should, was/were going to do, was/were doing）
过去将来时表示在过去某时就打算做的事情,或相对于过去将要发生的事情.
如：They were going swimming when I met them.
He said he would go to New York.
Yesterday he said it was going to rain, but it didn’t.
（九）复合时态.高中阶段所学到的复合时态主要有：
完成进行时,将来完成时和将来进行时.
完成进行时表示到目前为止一直在做某事.过去完成进行时还可以表示刚刚结束的进行动作.
如：He has been painting the house the whole morning.
They have been promising us to rise our salary these years.
They had been doing their homework for 3 hours before I came.
I asked him what he had just been doing?
He had just been sleeping before I got there.
将来完成时表示,到将来某时即将结束的动作.
如：We will have learnt 3000 English words by the end of next term.
They will have finished it by 12:00 tomorrow.
将来进行时表示将来某时正在进行的动作.
如：We will be sleeping at this time tomorrow.
She will be waiting there at 8 a.m. if you ask her to.