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Unit8 From hobby to career 语法:when引导的时间状语从句 & use to do sth
目录
语法要点一:when 引导的时间状语从句 1
语法要点二:used to/ didn’t use to(重点) 3
一、when引导的时间状语从句,40题 3
二、used to do sth,20题 6
语法要点一:when 引导的时间状语从句
(一)when 引导的时间状语从句(重点)
1.构成:when(当..的时候),可将两个分句连接在一个句子中,表示同时发生的两件事。when 引导的分句被称为“时间状语从句”,时间状语从句有两部分组成:
例句①.When I went out, it started to rain.
Part A(从句) Part B(主句)
例句②.Our dog welcomed me when I came back home from school.
Part A(主句) Part B(从句)
总结:when引导的从句可以放在主句前或者主句后,当位于主句前时,句中要用逗号隔开。(如例句①。)
2.用法:
1.注意主句和从句时态上的一致性:
① Mandy usually___________________(talk) to her friends when she is on her way to school.
② When I went out,it________________________(start)to rain.
答案:①. talks ②.started
2.When引导的时间状语从句+祈使句:表示请求或申明规则。
①When you see Jane,________________(give)her my regards.
你见到简的时候,请替我问候她。
②When there is a fire,_______(do)not use the lift.
遇到火宅时,请勿使用电梯。
答案:①give ②. do
3. 当描述将来发生的动作时,主句使用一般将来时,when引导的时间状语从句用一般现在时,即“主将从现”。(类似if/unless/as soon as /until)。
I _______________(visit) my parents when I have time.
我有空时会去看望我的父母。
答案:will visit
★其他引导词引导的时间状语从句
我们也可以用before (在......之前)、after (在......之后)、while (当......时)、as soon as (一......就)、until (直到......为止)等词(组)来引导时间状语从句,主从句的时态跟when引导的时间状语从句的主从句的时态用法一样。
例如:
1. You have to finish all the work before you go home.
你回家之前,必须完成所有的工作。
2. He usually takes a walk after he has supper.
吃完晚饭后,他经常散步。
3. We should be quiet while others sleep.
在别人睡觉的时候,我们应该安静。
4. I will call you as soon as I arrive in Beijing.
我一到北京就给你打电话。
5. My mother didn’t go to bed until I came home last night.
昨晚直到我回家,我妈妈才去上床睡觉的。
拓展:区别when/while/as 引导时间状语从句的用法(培优)
when 当...时候
1)延续性动词和非延续性动词
When he came in,she went out.
2)when从句谓语动词可以放在主句谓语动词之前,之后或者同时发生
When Lisa arrived, I was cooking.
3)可以主将从现
I will call you when I arrive in London.
while 当....时候,在.....期间, 与.....同时
1)延续性动词
He asked me a question while I was speaking
2)动作同时发生
He was watching TV while she was cooking
as 随着.... , 一边....一边...,正当....时候
1)延续性动词