1. 一般现在时：sometimes, often, usually, always, regularly ,generally, every day, once a week ,at present ,nowadays, at the moment every „ ,often, usually, sometimes ，always on Sunday . 概念：经常、反复发生的动作或行为及现在的某种状况。句末常有表示现在时间的短语。
. 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 ）。
. 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。
. 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。
. 例句：. It seldom snows here.
He is always ready to help others.
Action speaks louder than words.
2. 一般过去时：一般过去时常用的非持续性动词有come, go, leave, start, die, finish, become, get married等
Yesterday ,last week, three days ago, in 1980 ，the other day, last „ ,一段时间+ago, the day before yesterday
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。句末常有表示过去时间的短语。
. 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.
. 基本结构：be 动词；行为动词
. 否定形式：was/were+not;在行为动词前加didn't ，同时还原行为动词。
. 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。
. 例句：She often came to help us in those days.
I didn't know you were so busy.
3. 一般将来时：。 be going to, be to, be about to
tomorrow „ ,next„ ,in+ 一段时间,soon, the day after tomorrow . 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。 句末常有表示将来时间的短语。
. 时间状语：tomorrow, next day(week, m onth, year„),soon, in a few minutes, by„,the day after tomorrow, etc.
. 基本结构：am/is/are/going to + do；will/shall + do.
. 否定形式：was/were + not; 在行为动词前加didn't ，同时还原行为动词。
. 一般疑问句：be 放于句首；will/shall提到句首。
. 例句：They are going to have a competition with us in studies. It is going to rain.
4. 过去将来时：
should/would+动词原形（should 第一人称would 第二三人称) . 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。 . 时间状语：the next day(morning, year„),the following
month(week„),etc.
. 基本结构：was/were/going to + do；would/should + do.
. 否定形式：was/were/not + going to + do; would/should + not + do.
5. 现在进行时：
表示正在进行的词语 now, at the moment, at present, Look, Listen at this time, these days 概念：表示现阶段或说话时正在进行的动作及行为。
. 基本结构：am/is/are+doing
. 否定形式：am/is/are+not+doing.
. 一般疑问句：把be 动词放于句首。
. 例句： How are you feeling today?
He is doing well in his lessons.
6．过去进行时： at that time , then ,this time， yesterday(last week), at 10o'clock last night yesterday„ ,last„ ,一段时间+ago, the day before yesterday at that time或以when 引导
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。 时间状语：at this time yesterday,的谓语动词是一般过去时的时间状语等。
. 基本结构：was/were+doing
. 否定形式：was/were + not + doing.
. 一般疑问句：把was 或were 放于句首。
. 例句：At that time she was working in a PLA unit.
When he came in, I was reading a newspaper.
7. 现在完成时：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.。
how long, today, this year(month) ,lately ,recently , up to now, till(until),in the past, during already, yet, ever ,so far(迄今为止) , for+一段时间, since+时间点, just ,in the past/last +时间段
. 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。
8 过去完成时：
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”。
. 时间状语：before, by the end of last year(term,
month„),etc.
. 基本结构：had + done.
. 否定形式：had + not + done.
. 一般疑问句：had 放于句首。
. 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