山东省郯城第三中学高中英语语法大全：第16章连词（含巩固练习）_高考复习指南

　　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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