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种状况。
2.标志词： 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，动词上要改为第三人称单数形式）
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。
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。
2.标志词：ago, yesterday, the day before yesterday, last week,last(year, night, month…), in 1989, just now, at the age of 5, one day, long long ago
3.基本结构：be动词；行为动词 的过去式
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.例句：She often came to help us in those days
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.标志词：now, at this time, these days, etc.
3.基本结构：am/is/are+doing
4.例句： How are you feeling today?
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.标志词：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.例句：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.标志词：recently, lately, since…for…,in the past few years, etc.
3.基本结构：have/has + done
4.例句：The countryside has changed a lot in the past few years.
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.标志词：before, by the end of last year(term, month…),etc.
3.基本结构：had +过去分词.
4.例句：As soon as we got to the station, the train had left.
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.标志词：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.例句：They are going to have a competition with us in studies.
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.标志词：the next day(morning, year…),the following month(week…),.
3.基本结构：was/were/going to + do；would/should + do.
4.例句：He said he would go to Beijing the next day6.
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