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)
6. 引导条件状语从句的从属连词有:if(如果), unless(除非,如果……不)等。
If you don’t go soon, you’ll be late.=Unless you go soon, you’ll be late.
7.引导原因状语从句的从属连词有 because, as, since等。
because“因为”语气最强,回答why提问时只能用because,其引导的从句可放在句首或句末;as“由于”、since“既然”语气不如because强,引导的从句常置于句首;for是并列连词,语气最弱,对前面分句加以解释或补充说明,其引导的分句常置于句末且用逗号隔开。
He didn’t go to school because he was ill.
As it was raining, we went there by bus.
Since everybody is here, let’s begin.
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