英语八大时态怎样区分及应用啊

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.

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：be动词；行为动词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.

三、 现在进行时：

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.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+doing4.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.

五、 现在完成时：