初中英语语法知识点:状语从句 下载本文

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初中英语语法知识点:状语从句

为了提高同学们的英语复习效率,中国教育在线整理了初中英语语法之状语从句,状语从句是用来修饰主句中的动词,副词和形容词的从句。根据其含义状语从句可分为时间状语从句,地点状语从句,条件状语从句, 原因状语从句,结果状语从句,比较状语从句,目的状语从句,让步状语从句。

时间状语从句常用when, as, while, before, after, since, till, until, as soon as等连词来引导。例如:

It was raining hard when got to school yesterday. While he was doing his homework, the telephone rang. As he walked along the lake, he sang happily.

He had learned a little Chinese before he came to China. After he finished middle school, he went to work in a factory.

在时间状语从句里,通常不用将来时态,用现在时态表示将来的动作或状态。例如:

I’ll ring you up as soon as I get to New York. I will tell him everything when he comes back. He won’t believe it until he sees it with his own eyes. 在带有till或until引导的时间状语从句的主从复合句里,

如果主句用肯定式,其含义是“一直到……时”,谓语动词只能用延续性动词。如果主句用否定式,其含义是“直到……才……”, “在……以前不……”, 谓语动词可用瞬间动词。例如:

The young man read till the light went out. Let’s wait until the rain stops. We won’t start until Bob comes. Don’t get off until the bus stops.

条件状语从句通常由if, unless引导。例如: What shall we do if it snows tomorrow? Don’t leave the building unless I tell you to.

在条件状语从句里,谓语动词通常用现在时态表示将来的动作或状态。例如:

I’ll help you with your English if am free tomorrow. He won’t be late unless he is ill.

“祈使句 + and + 陈述句” 在意思上相当于一个带有条件状语从句的复合句。例如: Hurry up, or you’ll be late.

=If you don’t hurry up, you’ll be late. Study hard and you will pass the exam. =If you study hard, you will pass the exam.

原因状语从句通常由because, since, as引导。例如:

He didn’t come to school because he was ill. As it is raining, we shall not go the zoo.

Since you can’t answer the question, I’ll ask someone else. because表示直接原因,语气最强。Because引导的原因状语从句多放在主句之后。回答由why提出的问题,只能用because。As和since语气较弱,一般用来表示明显的原因。由as和since引导的原因状语从居多放在句首。例如: ------Why aren’t going there? ------Because I don’t want to.

As he has no car, he can’t get there easily. Since we have no money, we can’t buy it. because和so不能同用在一个句子里。