6 条件状语从句 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. 【查看更多】
