4.表示因果关系的并列连词有:for(因为),so(所以)。
He is not at school today, for he has a bad cold.
It was late, so I went home.
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)
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