在中,单独考察的题几乎没有,但是语法知识点却贯穿整张试卷,下面是频道为大家整理的知识,希望可以为大家带来帮助,一起来学习一下吧。
英语四级重点语法知识: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. ifD. 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.