新SAT资讯分享

周五好呀!马上就是小长假了!SAT语法中,对于句子的结构以及时态,是我们需要掌握的基本语法知识。今天我们重点来讲解的是时间状语从句的时态内容。下面课代表为大家整理了详细的内容,供大家参考!

SAT语法:时间状语从句时态

一.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.

二. 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

以上是今天的干货内容,希望可以帮助到大家!还有!欢迎联系哆啦A智获得更多备考资讯哦~

波士顿学习中心备考小助手

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