2019年英语四级12卷1答案_2019年12月英语四级高级语法讲解：状语从句之条件状语

【#四六级考试# 导语】©文档大全网英语四级频道为备考英语四级的同学们整理了2019年12月英语四级高级语法讲解：状语从句之条件状语，希望可以为大家带来帮助，预祝大家高分通过大学英语四级考试。

条件状语从句：

　　(1)连接词：if, once, as long as, on condition that

　　① 如果引导的条件可以实现，主将从现;

　　② 如果引导的条件和事实相反，则用虚拟语气;

　　eg：If winter comes can spring be far behind.

　　As long as it doesn't rain, we can play.

　　You can go out on condition that you wear an overcoat.

　　Modern cars are far tougher to steal, as their engine management computer won't allow them to start unless they receive a unique ID code beamed out by the ignition (点火) key.

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