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-It’s at four o’clock on Friday. 4. Thanks a lot for the invitation.
5. I’m going to study for a test this evening. 6. What’s the date today?
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状语从句用法 一、什么是状语从句?
用一个句子(从句)来作另一个句子(主句)的状语,用作状语的句子就叫作状语从句。作什么样的状语就叫什么类型的状语从句。例如:条件状语从句就是用一个句子来作条件状语。 二、状语从句的分类。 (1)时间状语从句用法要点
凡是从句都必须有引导词,引导时间状语从句的词有when,before,after,until,as soon as,while 等,具体用法如下: 1. when 意为“当……时”,引导时间状语从句,表示主句的动作和从句的动作同时或先后发生。例如:
I feel very happy when you come to see me. 你(们)来看我时,
我感到很高兴。
When you are crossing the street,you must be careful. 你(们)过街道时,一定要小心。
when引导的时间状语从句,when的从句可以用延续性动词,也可以用点动词。 eg.
He was working at the table when I went in. 当我进去的时候,他正在桌旁工作。
Someone knocked at the door when I was sleeping. 当我正在睡觉时,有人敲门。
I will visit my good friend when I have time. 当我有空儿时,我将去看望我的好友。
I worked for a foreign company when I was in Shanghai. 当我在上海时,我为一家外国企业工作。 注:when也可以作并列连词,表示一个动词正在进行的时候,突然间发生了另外一件事。eg.
I was fishing by the river,when someone called for help. 我正在河边钓鱼,就在那时有人求救。
We were working in the chemistry lab,when the lights went out.
我们正在化学实验室工作,突然灯都熄灭了。
2. before 意为“在……之前”,引导时间状语从句时,表示主句的动作发生在从句的动作之前。例如:
We cleaned the classroom before we left school yesterday.
昨天离开学校之前,我们打扫了教室。
He had been a cook before he went to college . 他上大学前曾当过厨师。
after 意为“在……之后”,引导时间状语从句时,表示主句的动作发生在从句的动作之后。 例如:
After you use plastic bags,you mustn't throw them about.
你(们)用过了塑料袋之后,不准到处乱扔。 He called me after he had finished his work. 他在工作完之后给我打了个电话。
注:若主句和从句两个动作发生的先后顺序十分接近,那么也可以不用完成时态,例如上面的第二句可改成:He called me after
he finished his work.
3. since引导的时间状语从句,译为“自从……”,主句常用现在完成时,从句常用一般过去时。eg.
We have made many dumplings since we began to cook.
自从我们开始做饭起,我们已经包了许多饺子了。 We haven't seen each other since we parted . 我们自从分手以后一直没见过面。
注:常用句型:It is +时间段+since从句 译为:自从……有多长时间了。eg.
It is six years since she graduated from the university. 自从她大学毕业已有六年的时间了。
4. until 意为“直到……时”,引导时间状语从句时,表示主句的动作发生在从句的动作之前。
当主句的谓语动词是持续性动词时,主句常用肯定形式;当主句的谓语动词是非持续性动词时,从句常用否定形式,not…until… 意为“直到……才……”,这时的until可以用before 来替换。例如:
I'll stay here until you come back. 我会呆在这里,直到你回来。(stay表示的动作可以持续)
He didn't go to bed until he finished his homework.他直到做完作业才睡觉。
(go to bed 表示的动作不能持续)
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