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过去完成时态,一般过去,现在完成有什么区别

过去完成时态,一般过去,现在完成有什么区别

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过去完成时态,一般过去,现在完成有什么区别

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.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.

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.

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.时间状语: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,once upon a time,etc.

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.

5.一般疑问句: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.

6.例句:She often came to help us in those days.

I didn't know you were so busy.

3、 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.

6.例句:I've written an article.

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.时间状语:before,by the end of last year(term,month…),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

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