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条件状语从句
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发布时间:2006-05-23
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连接词主要有 if, unless, as/so long as, on condition that 等。. if 引导的条件句有真实条件句和非真实条件句两种。非真实条件句已在虚拟语气中阐述。
unless = if not. Let's go out for a walk unless you are too tired. If you are not too tied, let's go out for a walk.
典型例题 You will be late ___ you leave immediately. A. unless B. until C. if D. or 答案A。 句意:除非你立即走,否则你就回迟到的。可转化为 If you dong leave immediately, you will be late. B、D句意不对,or表转折,句子如为 You leave immediately or you will be late.
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