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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. 例如： Lets go out for a walk unless you are too tired. 如果不太累，我们去散散步。 If you are not too tied， lets 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. | 
