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1、状语从句的知识点的复习与练习讲稿一状语从句主要有：时间状语从句，其连接词有：after, before, when, as, as soon as, until （till）, while, since, by其中较难掌握的有以下几点： until （till） 直到,在用 until 表达时间状语的句子中,主句中的动词是要十分 小心去选择。如动词是持续性动词,它要用肯定句，如：I studied hard until 12 oclock last night.如果动词是瞬间截止性动词（又称为终止性动词）,则要用否定句，如：He didnt go to bed until his mother
2、 came backD 由口since, for, by, before来引导的时间状语从句。since引导的时间状语 是动作的开始时间,如：I have studied English since 1990. 而由 by 引导的时间状语通常是动作的结束时间,如：I had learned 25 English songs by the end of last term.而before则多用于完成时，ago则多用于一般过去时，如：He had finished his work before twelve yesterday. I left my hometown two years agoD
3、 在状语从句中用一般现在时或一般过去时表示将来。 它们可能是主句用一般将来时, 从句用一般现在时, （即：时间状语从句和条件状语从句中，用一般现在时去代替一般将来 时） 如：If it rains, they wont go to the park on Sunday. 也可以主句是一般过去时, 从句用一般过去进行时,如：He said if it rained the next day he would not go to the park. 考试中常见的考点有：要学生区别是条件、时间状语从句还是宾语从句，因在宾语从句 中该用什么时态用什么时态，如：I want to know if he
4、will come here tomorrow.在宾语从句中的条件状语从句与主句的关系，如：I want to know if it rains he will come here tomorrow. 在原因状语从句中主要是 because， 应译为因为。它表达的因果关系最强，如：He didnt pass the exam because he didnt study hardD since 应译为既然，如：Since you were ill yesterday, I left some notes on your desk. as 应译为由于，如：As it is too hot wed
5、 better go swimming.since 与 as 所表达的因果关系远比 because 弱得多。而 for 表达的因果关系最弱 它不能用于句首，如：He studies hard, for he wants to go to college 在比较状语从句中有同级比较 as as， 如：This book is as good as that oneD 要注意的有两点： as as 中间要用原级而不是比较级。 用形容 词还 是副 词 ,如：Mary writes as carefully as Tom. 而其否定句为not as (so) as, 如：They didnt work
6、 so hard as we did，而不同级比较用比较级加than,如：He is younger than I amU要注意的是表示越来越这一概念时有两个句型： 比较级+ and +比较级，如：The days are getting longer and longer.UThe little girl is becoming more and more beautiful.U 定冠词 the +比较级+ the +比较级，如：The harder you study， the more you can learn方式状语中要注意的是as （连词）与like （介词）的区别。as 作为连词
7、其后接从句，如：Please do it as I did itU但后面的句子常作省略，如：Please do it as I.U而like是介词，其后要接的是宾语，如：Please do it like me.结果和目的状语从句主要有so that， so that， in order that等几种用法。 so that用在单数可数名词前，so +形容词+ a +名词+ that，如： She is so beautiful a girl that everyone likes her.或用 such+ a +形容词 +名词 + that， 如：She is such a beautifu
8、l girl that everyone likes herU 在不可数名词或可数名词复数前只能用such，如：It is such good weather we want to go for a picnic 又如： They are such good players that they should win the game. 在much, many, few, little之前只能用so, 如：I have so little money that I cant buy 辻口 so that 之间只有形容词时, 则不能用 such, 如：It is so good that I wa
9、nt to buyD so that 其后接从句,如：I got up earlier so that I could catch the first busD讲稿二一） 时间状语从句：由 when, while, before, after, since, as soon as, till / until 引导的从句1）when与while （when +短命动词）（while+长命动词）eg.1）Ill tell her the good news he comes back.2）Aunt Wang came in while we were watching TV引since:自从以来（
10、since从句常用一般过去时）注意主句通常用现在完成时，但当主句表示一种状态，用一般现在时eg.1）He has lived there since he came to China2）It is two years since her mother died.（二）条件状语从句：由if （如果）引导的从句eg.I will go to the park if it （not rain） tomorrow.注意：条件状语从句与以下句型的转换1 祈使句，and (then , or)+简单句二 If you ,you eg.1)Use your head, then youll find a w
11、ay.=If you use your head, youll find a way2)Hurry up, or youll be late.=If you dont hurry, youll be late.2)without与条件句的转化eg. Man cant live without water.二Man cant live if there is no water.注意以上两种状语从句的时态主句时间、条件句1) 一般将来时2)祈使句3)情态动词原形一般现在时一般过去时一般过去时但since从句例外，应与现在完成时连用。eg.1)Ill call you as soon as he (
12、come) back.2) He wont go to bed until he (finish) his homework.3) Ill help you if I (be) free tomorrow4) I (live) here since I came to China.(三)原因状语从句：由because, since , for , as引导的从句eg. He didnt go to school because he was ill.注意：1)对because引导的从句提问用why2)因为(because),所以(so)不能连用eg. Because he was (A) il
13、l, so (B) he didnt (C) go to school (D) yesterday.（四）结果状语从句：由sothat引导的从句（so后接形、副原级）eg. He ran (A) so faster (B) that I couldnt catch up with (C) him. 注意：1) sothat +否定句”与tooto”的替换 eg.1)He is so young that he cant go to school.二 He is too young to go to school(主、从句主语相同)2) He ran so fast that we couldn
14、t catch up with him.二 He ran too fast for us to catch up with.(主、从句主语不同)3) The box is so heavy that I cant carry it二 The box is too heavy for me to carry.(注意 carry 后省去宾语 it)2)，sothat +从句”与enough to”的替换eg.1)Hes so strong that he can carry the box.二 Hes strong enough to carry the box.2)The question is
15、 so easy that I can answer it二The question is easy enough for me to answer练习she didnt like it.( )1.We bought granny a present,A. but B. and C. when( )2.Be quick, _ youll be late for the football match.A. so B. and C. or( )3.Youve done badly, _ I can see you did your best. A. or B. but C. so( )4.That was our first lesson, _ she didnt know all our names.A. for B. but C. so ( )5.They didnt pass the ball often enough, _ they didnt play together very
