1 时间状语从句条件状语从句词条含义用法例句if从句 +祈使句如果......,就 ......(指 能 够 发 生或可能发生的事件) 1. 位置可在主句前也可在主句后； 2. 表建议If you want to go, please tell me. If you don’t feel well, please go to see the doctor. if 如果（表假设）1. 从句表示某种假设， 主句表示此种情况所导致的结果。 2. “主将从现” ；She may come with us if she arrives in times. If he doesn’t work hard,he will fail his exam. 词条含义用法例句when 当......时候1. 其引导的从句的时间状语既可以是“时间点”也可以是“时间段”； 2.从句的动词既可以是短暂性动词也可以是延续性动词；3. “主将从现”I ’m going to be a teacher when I grow up. Be careful when you cross the road. while 当......时候; 和......同时1. 引导的从句的时间状语只可是“时间段”；2. 从句的动词只可是延续性动词或表状态的词；3. 从句中持续性词常用进行时态I met Anne while I was taking a walk in the park. While he was watching TV, he fell asleep. as soon as 一......就...... 1. 主句与从句的动作几乎同时发生；2. “主将从现”Please call me as soon as he comes back. before/after 在......之前/ 后1. 在 before 和 after引导的时间状语从句“主将从现”2.after引导先后发生的两个动作时，这两个动作都可以用一般过去时He will come to see you before he leaves Beijing. After I came back he went to the factory. until 直到 ...... 1. 肯定句中，谓语动词必须是延续性动词； 2. 否定句中，谓语动词既可是延续性动词也可是非延续动词。He will wait until I arrive. The girl didn ’t go to the bed until she finished her homework by herself. since 自从表示从起点到现在的时间段，主句一般用完成时态。She has lived alone since her husband died five years ago. 2 because , so that ,so ,so ...that,though/although引导的状语从句词条 / 含义引导的从句类型用法例句because 因为；由于原因状语从句1. 表示必然的因果关系，语气较强，通常放在主句之后，若强调原因则放在主句之前； 2. 常用来回答w...
