口诀一
主句动作过去时,
从句时态要一致。
主句动作将发生,
将来时态常常用。
时间条件从句中,
现在时态要记清。
口诀二
状语从句三要点,时间,原因和条件;
从句如果表时间,after,before,when常用;
状语从句表原因,because一马来当先;
状语从句表条件,if前面来引导;
主句通常前面走,从句紧紧跟在后。
从句如在主句前,从句之后加逗点。
主从句时态呼应,即主句用现在时,从句也用现在时;主句用过去时,从句也用过去的某种时态,除此之外,主句用将来时,从句依然要用现在时。
eg.Be careful when you cross the road。
When he was seven years old, he could swim.
When she leaves, she will turn off the light.
不同的时间状语需要搭配不同时态的使用
1.Often,usually----------动词原型do,does,am,is,are
2.yesterday,last Sunday,in the past-------动词过去式did,was,were
3.now--------be+doing
4.while,at that time,-------was doing,were doing
5.since从句,for 2 days,------have done,have been
since+过去的某个时间点----had done,had been
一般现在时:every…,sometimes,at…,on Sunday,
一般过去时:yesterday,last week,an hour ago,the other day,in 1982,just now
一般将来时:next…,tomorrow,in+时间,
现在完成时:for,since,so far,ever,never,just,yet,till/until,up to now,in past years,always,recently
过去完成时:before,by,until,when,after,once,as soon as
过去进行时:this morning,the whole morning,all day,yesterday,from nine to ten last evening…when, while
将来进行时:soon,tomorrow,this evening,on Sunday,by this time,tomorrow,in two days,tomorrow evening