原因状语从句之欧阳育创编

1、二、原因状语从句:创作：欧阳育时间：2021.02.04Is定义：在句中用来说明主句原因的句子叫原因状语从 句。2、常用引导词：because（因为）,as（由于）,since （既然）,now （that）（既然）3、时态：原因状语从句一般都是根据实际情况选用适当的 时态。通常是主过从过,主现从现。4、because, since 和 as 的区别:1） because引导的原因状语从句一般放于主句的后面， because从句位于句首时要用逗号分开，放在句末时，可不用 逗号分开。because表示直接原因，语气最强，最适合回答 why引导的疑问句。because of也表示原因，但它后面不接

2、从 句，只能接名词，代词或动名词。注意:because和so不可同时 出现在一个句子里。1 I do it because I like it.二 I like it sol do it.We went by bus because it was cheaper. = It was cheaper sowe went by bus.3 He can't go to school because of his illness.2) since引导的原因状语从句一般放于主句之前表示已知 的、显然的理由(通常被翻译成“既然”二now that),较为正 式，语气比because弱。1 Sin

3、ce you are free today, you had better help me with my mathematics.Since you don't trust him, you should not employ him.3 Now (that) you are grown up, you should not rely on your parents.3) as引导原因状语从句时表示附带说明的“双方已知的原 因”，含有对比说明的意味，语气比since弱，较为正式，位 置较为灵活(常放于主句之前)。1 As it is raining, you'd better

4、 take a taxi.As you are tired, you had better rest.3 I we nt to bed early, as I was exhausted.4) for引导的是并列句表示原因但并不说明主句行为发生的 直接原因，只提供一些辅助性的补充说明，for引导的并列句 只能放于主句之后并且必须用逗号将其与主句隔开。1 He could not have seen me, for I was not there.He seldom goes out now,for he is very old.5.三、目的状语从句：1、定义：在句中用来作目的状语的句子叫目的状

5、语从句。2、常用引导词：so that（以圜,in order that （以便）3、时态：目的状语从句一般都是根据实际情况选用适当的 时态。也通常是主过从过,主现从现。4、目的状语从句应注意以下：1）目的状语从句中常含有can,could,may,might,should, will, would等情态动词。I got up early so that I could catch the first bus.2）在口语中so可以引导目的状语从句。We'll sit nearer the front so we can hear better.3）in order that 与 in

6、order to 的区别: in order that + 从句二 so that + 从句 in order to+动词原形二so as to +动词原形（不放于 句首）二to+动词原形I get up early in order to catch the early bus.二 I get up early in order that I can catch the early bus.四、结果状语从句:lx定义：在句中用来作结果状语的句子叫结果状语从句。2、常用引导词：sothat（如此以致）,suchthat（如此 以致）3、时态：结果状语从句一般都是根据实际情况选用适当的 时态。也

7、通常是主过从过,主现从现。4、结果状语从句的句型:结果状语从句的从句部分是补充说明主句中谓语动词发生的 结果的，通常位于主句之后。结果从句中通常不用情态助动 词，但must, can, could除外。结果状语从句其规律由so与 such的不同词性决定。such是形容词，修饰名词或名词词组， so是副词，只能修饰形容词或副词。so还可与表示数量的形 容词many, few, much, little连用，形成固定搭配。6.1) so +形/副+ that从句1 The boy isso young that he can't go to school.He speaks so fast

8、 that no one can catch him.2) so+ many/few (+复名)+ that 从句There are so many picture-story books that the boy won't leave.3) so+much/little (+不可数名词)+that 从句He gave me so little time that it was impossible for me to finish the work on time.4) so+ 形 + a/an+ 单名+that 从句It was so hot a day that they wa

9、nted to go swimming.5) such+ a/an+ 形+单名 + that 从句二 so+ 形 + a/an+单 名+ that从句He is such a young boy that he can't go to school.=He isso younga boy that he carft go to school.6） such+形+复名/不可数名词+ that从句1 They are such fine teachers that we all hold them in great respect. It is such nice weather that

10、 I would like to go to the beach.5、结果状语从句与简单句的转换:1）sothat （从句为肯定句）=形/副+ enough + （for sb.） to do sth.He is so old that he can go to school alone.二 He is old enough to go to school alone.2）sothat （从句为否定句）= too +形/副+ （for sb.） to do sth.The problem is so hard that I can't work it out.二 The problem

11、 is too ha id for me to work out.二 The problem isn't easy enough for me to work out.五、让步状语从句1定义：在句中用来表示“退一步说”的句子叫让步状语 从句。2、常用引导词:although （虽然）二though （尽管,即 使）,no matter+疑问词二疑问词-ever （无论）,even i仁 even though （即使）,whether. or *（不管是还是）等。3、时态:让步状语从句的时态一般采用主过丛过，主将从 现的原则。4、让步状语从句的注意点:1) although/thoug

12、h不可与but连用(二者只选其一)， 但可与still / yet连用。1 Although/Though he is very old, still he is quite strong.Although he was ill, he went to school.= He was ill but he went to school.7.2) no matter+疑问词二疑问词-ever “无论”(引导让步 状语从句可互换)1 Whatever (= No matter what) happened, he would not mind.©Whoever (= No matter

13、who) you a re,you must keep the law.3 However (=No matter how) expensive it may be, 111 take it.注意：“no matter+疑问词”结构只能引导让步状语从句，而 “疑问词eve广还可以引导名词性从句(主语从句，宾语从句， 表语从句和同位语从句)。4 I'll eat whatever (Hno matter what) you give me.（whatever引导宾语从句）Whoever （H no matter who） comes will bewelcome, （whoever引导主

14、语从句）六、条件状语从句lx定义:由引导词if或unless引导的状语从句叫做条件状 语从句。2、常用引导词:if （如果）,unless = if- not （如果不/除非），so/as long as（只要）3、时态:条件状语从句的时态常采用主将从现厘则。1 I will come to see you if I have time Let's go out for a walk unless you are too tired.二 Let's go out for a walk if you are not too tired.3 You can't learn English well unless you work hard.二 You can't learn English well if you don't work hard.4 You may borrow my book as long as you keep it clean.所使句相当于一个由if引导的条件状语从句：用and引导的简| |单句常表示一个较好的结果，用。引导的简单句常表示一个不|sth.这个句型表示“如果