Unit 4 语法专练：时间和原因状语从句2023-2024学年冀教版八年级英语上册

八上第四单元语法专练：时间和原因状语从句 第一部分：知识点梳理 一 时间状语从句：在复合句中起时间状语作用的从句，可放在句首，句中，句尾。初中阶段常用的引导时间状语从句的词有：when, while, as, before, after, till, until等 1.when的用法 （1）其引导的从句谓语动词可以用持续性动词，也可以是终止性动词 （2）从句的动作与主句的动作可同时发生，也可以先后发生。 （3）起引导的时间状语从句可放在句首，也可以放在句尾。 （4）当主句为将来时或含有将来时含义时，when引导的时间状语从句要用一般现在时表示将来。 2.while的用法 （1）其引导的从句谓语动词必须是持续性的或者是表示状态的动词。 （2）强调主句与从句的动作同时发生，或者主句动作发生在从句动作进行中。 二 原因状语从句：在复合句中作原因状语的从句成为原因状语从句，可放在句首，也可以放在句尾。初中阶段常见的引导原因状语从句的词有：because, as, since,等。 1.because的用法 （1）语气最强烈，常用来回答why引起的提问，表示已知或未知的事实。 （2）其引导的从句常位于主句之后，表示强调时也可放在主句前。 （3）不能和so连用。 （4）because of是表示因果关系的词组，其后只能加名词性短语。 第二部分：专项练习 一 用when和while填空 1.______ the fire broke out, all the students were sleeping. 2.Father was preparing a report______ I was playing games. 3.Never get on or off the bus ______ it is in motion.（移动） 4.Mary was having dinner______ I saw her. 5. ______ you meet a new word, you can look it up in a dictionary. 6. ______ I am learning about English, I am also learning a new culture. 7.The boy will be a writer______ he grows up. 8.The postman arrived______ I was leaving the house. 二 用because 和because of填空 1.He was punished ______ he broke the law. 2.Mr. Green didn’t come ______ the rain. 3.Mr. Green didn’t come ______ it was raining heavily. 4. I got high marks in the English exam______ studying hard. 三 选择 ( ) 1.The old man can’t get on the bus______ there is no room on it. A though B because C until D so that ( ) 2.Don't worry. I will help you look after your dog when you ________ away on business. A are B were 　C will be D．have been ( ) 3. We have to put off (推迟)________our meeting ________the bad weather. A．hold; because B．hold; because of C．holding; because D．holding; because of ( ) 4.I can’t sleep well at night, _____ I often feel tired in the day. A．but　　B．and　　C．because ( ) 5.I am writing to you _____ I'm afraid to talk about it face to face. A．because B．though C．until ( ) 6.I didn't go surfing _____ it was too cold. A．though　B．so that　C．because ( ) 7.I studied very ha