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英语中的八个基本时态，即：一般现在时、一般过去时、一般将来时、过去将来时、现在进行时、过去进行时、现在完成时、过去完成时。

一般现在时
1.概念：指经常、反复发生的动作或行为及现在的某种状况。
2.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.
7.特殊用法：一些动词可用一般现在时来表达现在进行时：
verbs of the senses: hear,see,taste,smell
verbs of the thinking: believe,know,mean,realize,think,remember

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。
2.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：含有Be动词主语+was/were+形容词或者名词......
不含有be动词：主语+动词过去式+......
4.否定句：带be:主语+was/were not+形容词或者名词+......
不带be：主语+didn't+动词原形+......
5.一般疑问句：含be动词was或were放于句首；
不含be动词用助动词do的过去式did 提问，同时还原行为动词原型。
Did+主语+动词原形+……？
6.例句：She often came to help us in those days.
I didn't know you were so busy. [1]
She sang a song of Lin Feng yesterday [2] .

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：Be动词（am/is/are）+doing
4.否定形式：Be动词（am/is/are）+not+doing.
5.特殊疑问句：把be动词放于疑问词的后面。
6.例句：How are you feeling today?
He is doing well in his lessons.
7. 一般表示位移的词如leave fly arrive go come. 等用现在进行时表将来。
I am flying Beijing next week .表示我下周即将飞往北京。
He is leaving for Beijing tomorrow. 他明天即将去北京。
8.现在进行时就是一个动词后面加ing

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.

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 + done.
5.一般疑问句：have或has提前。
6.例句：I've written an article.
It has been raining these days.

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…),by the time...,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

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：am/is/are + not+going to；will/shall+not(will适用于所有人称，shall只用于第一人称）
5.一般疑问句：be放于句首；will/shall提到句首。
6.例句：They are going to have a competition with us in studies.
It is going to rain.
I think he will be back soon

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 . 

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