摘要:4.引导时间状语从句的连词: A. when.as soon as-.not-until.after.引导的主从复合句.主句为一般将来时.从句则用一般现在时来代替一般将来时. Eg: I won't leave until he comes back. B. since引导的主从复合句.主句为现在完成时.从句用一般过去时. Eg:We haven't met each other since she left here last year. C. while它引导的时间状语从句常用进行时态. Eg: My father came in while I was doing my homework.

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