浙江专升本 | 浙江专升本考试英语语法第十六章——引导时间状语从句的从属连词
发布时间：2020-12-20浏览：次
编辑：xinting
5.引导时间状语从句的从属连词有：before, after, when, while, as, till, until, since, as soon as等。
After they had planted their crops, they took a rest.
We have learned six lessons since he began to teach us.
As soon as he gets to Beijing, he’ll call me.
1) when, while, as 都表示“当……时”，when从句谓语动词既可以是瞬间动词也可以是延续性动词，可用于主从句动作同时发生或从句动作先于主句动作发生。while从句谓语动词只能是延续性动词，侧重主从句动作同时发生。as引导一个持续性动作，多用于主从句动作同时发生，强调“一边……一边”。
When I came in, my father was cooking.
I came in when/while my father was cooking.
He sang as he walked.
2)until用法：当主句谓语动词是延续性动词时，主从句都用肯定式，译为“直到……为止”；当主句谓语动词是瞬间动词时，主句用否定式，从句用肯定式，即not…..until, 译为“直到……才”。
Mr. Green waited until his children came back.(格林先生一直等到他的孩子们回来)
Mr. Green didn’t go to bed until his children came back. (格林先生直到他的孩子们回来才睡觉)
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