2016-06-23
xredued04
一、状语从句
1、时间状语从句：引导时间状语从句的连词有when/while/as/as soon as/until/not…until/before/after/since等。
例如：
When you leave, please take a raincoat with you.
As soon as she got home, she began to make dinner.
注意：
(1)while意为“当…期间”，从句中的谓语动词一般用进行时态。
例如：
Take notes while you are listening to the teacher.
(2)while侧重主句中谓语动词表示的动作或存在的状态与从句谓语动词所表示的动作或存在的状态的对比，常译为“而”。
例如：
He is a worker while I am a student.
(3)not…until,直到……才，主句谓语动词必须是非持续性动词而且主句是否定式，从句为肯定式。
例如：
He did not go to bed until his mother came.
(4)在时间状语从句中要用一般现在时表示将来时间。
例如：
Mr. Smith will telephone you when he returns.
2、原因状语从句：引导原因状语从句的连词有：because/as/since等。
例如：
His sister is in bed because she is ill.
注意：含原因状语从句的复合句，有时可以转换为用so连接的并列句，故because和so不能同时出现在一个句子中。
例如：
He did not come here because he was busy.
He was busy, so he did not come here.