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  • 2021-10-12 发布

初中英语语法归纳:状语从句

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‎ ‎ 初中英语语法归纳:状语从句 ‎ 状语从句是用来修饰主句中的动词,副词和形容词的从句。根据其含义状语从句可分为时间状语从句,地点状语从句,条件状语从句, 原因状语从句,结果状语从句,比较状语从句,目的状语从句,让步状语从句。‎ ‎  1. 时间状语从句 ‎  (1)时间状语从句常用when, as, while, before, after, since, till, until, as soon as等连词来引导。例如:‎ ‎  It was raining hard when got to school yesterday.‎ ‎  While he was doing his homework, the telephone rang.‎ ‎  As he walked along the lake, he sang happily.‎ ‎  He had learned a little Chinese before he came to China.‎ ‎  After he finished middle school, he went to work in a factory.‎ ‎  (2)在时间状语从句里,通常不用将来时态,用现在时态表示将来的动作或状态。例如:‎ ‎  I’ll ring you up as soon as I get to New York.‎ ‎  I will tell him everything when he comes back.‎ ‎  He won’t believe it until he sees it with his own eyes.‎ ‎  (3)在带有till或until引导的时间状语从句的主从复合句里,如果主句用肯定式,其含义是“一直到……时”,谓语动词只能用延续性动词。如果主句用否定式,其含义是“直到……才……”, “在……以前不……”, 谓语动词可用瞬间动词。例如:‎ ‎  The young man read till the light went out.‎ ‎  Let’s wait until the rain stops.‎ ‎  We won’t start until Bob comes.‎ ‎  Don’t get off until the bus stops.‎ ‎2. 条件状语从句 ‎  (1)条件状语从句通常由if, unless引导。例如:‎ ‎  What shall we do if it snows tomorrow?‎ ‎  Don’t leave the building unless I tell you to.‎ ‎  (2)在条件状语从句里,谓语动词通常用现在时态表示将来的动作或状态。例如:‎ ‎  I’ll help you with your English if am free tomorrow.‎ ‎  He won’t be late unless he is ill.‎ ‎  (3)“祈使句 + and (or)+ 陈述句” 在意思上相当于一个带有条件状语从句的复合句。例如:‎ ‎  Hurry up, or you’ll be late.‎ ‎  =If you don’t hurry up, you’ll be late.‎ ‎  Study hard and you will pass the exam.‎ ‎  =If you study hard, you will pass the exam.‎ ‎3. 原因状语从句 ‎  (1)原因状语从句通常由because, since, as引导。例如:‎ ‎  He didn’t come to school because he was ill.‎ ‎  As it is raining, we shall not go the zoo.‎ ‎  Since you can’t answer the question, I’ll ask someone else.‎ ‎  (2)because表示直接原因,语气最强。Because引导的原因状语从句多放在主句之后。回答由why提出的问题,只能用because。As和since语气较弱,一般用来表示明显的原因。由as和since引导的原因状语从居多放在句首。例如:‎ ‎  ------Why aren’t going there?‎ ‎  ------Because I don’t want to.‎ ‎  As he has no car, he can’t get there easily.‎ ‎  Since we have no money, we can’t buy it.‎ ‎  (3)because和so不能同用在一个句子里。‎

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