原因状语从句之欧阳术创编

1、欧阳术创编2021.02.02欧阳美创编2021.02.02欧阳术创编2021.02.02欧阳美创编2021.02.02二、原d NIf | n时间：2021.02.02创作：欧阳术1、定义：在句中用来说明壬句原因的句子叫原因状培从句。2、常用引导词：because（因为）,as（由于）,since （既然）,now （that）（既然）3、时态：原因狀培"、句一般部是根据实际情况选用适当的时 态。通常是主ilUil,壬现从现。4、because, since 和 as 的区别:1）because引导的原因狀培卩、句一般赦于主句的后面，because 从句位于句首时要用逗号分开，故在

2、句末时，可不用逗号分开。 because表示直接原因，培气最强，最适合回答why引导的疑 间句o because of也表示原因，但它后面不接”、句，只能接名词, 代词或动名词。注意:because fH so不可同时出现在一个旬子里。 I do it because I like it. = I like it sol do it. Wc went by bus because it was cheape匚二 If was cheaper sowe went by bus. He can't go to school because of his illness.2）since引导的

3、原因狀培JJ、句一般赦于主句之前表示已知的、 显然的理由（通常被翻译成“既然?,= now that）,较为正式,语气 比 because 弱 o Since you are free today, you had better help me with my mathematics. Since you don*t trust him, you should not employ him. Now （that） you are grown up, you should not rely on your parents.3）as引导原因状培从旬时表示附带说明的“双方已知的原因"，含有

4、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）。 As it is raining, yoifd better take a taxi. As you are tired, you had better rest. I went to bed early, as I was exhausted4）for引导的是并列句表示原因但并不说明壬句行为发生的 直接原因，只提供一些蒲助性的补充说明，for引导的并列旬只 能放于主句之后并且必须用逗号将其与主句隔开。©He could not have seen me, for I was not thereHe s

5、eldom goes out now,for he is very old.5.三、目的状语从句：1、定义：在旬中用来作目的状语的旬子叫目的状培从旬。2、常用引导词：so that（以便）,in order that （以便）3、时态：目的状语）J、句一般部是根据实际情况选用适当的时 态。也通常是壬过从过，主现卩、现。4、目的状培从句应注意HT：1）目的状培从旬中常含有 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

6、句。We*ll sit nearer the front so we can hear bette匚3）in order that 与 in order to 的区别: in order that + 从旬=so that + 从句 in order to+动词原形二so as to +动词原形（不放于句首） =to+动词原形I get up early in order to catch the early bus.=I get up early in order that I can catch the early bus.0.结果状培从句：1、定义:在旬中用来作结果状语的旬子叫结果状语从

7、句。2、常用引导词:so. that（如此以致.）,such.that （JU此 以致）3、时态：结果狀培卩、句一般那是根据实际情况选用适当的时 态。也通常是主ilUil,主现"、现。4、结果状语从句的句型:结果状培）J、句的从旬部分是补充说明主旬中谓语动词发生的 结果的，通常位于壬旬之后。结果"、句中通常不用情态助动词， 但must, can, could除外。结果狀培卩、句其规律由so与such的不 同词性决定。such是形容词，修術名词或名词词组，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

8、搭配。6.1) so +形/副+ that从句©The boy isso young that he can't go to school.He speaks so fast that no one can catch him.2) so+ many/few ( + 复名)+ that 卩、句There are so many picture-story books that the boy won't leave.3) so+much/little ( +不可数名词)+that R 句He gave me so little time that it was imp

9、ossible for me to finish the work on time.4) so+ 形 + a/an+ 单名 +that R 句It was so hot a day that they wanted to go swimming.5) such+ a/an+ 形 + 单名 + that 卩、句=so+ 形 + a/an+ 单名 + that U 旬He is such a young boy that he can*t go to school.=He isso younga boy that he can't go to school.6) such+形+复名/不可数

10、名词+ that R句 They are such fine teachers that we all hold them in great respect It is such nice weather that I would like to go to the beach.5、结果状培从句与简单句的转换：1）so. that （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=He is old enough to go to school alone2）so.

11、that （从句为否定句）=.too + 形 / 副 + （for sb.） to do sth.The problem is so hard that I caift work it out.=The problem is too hard for me to work out.=The problem isift easy enough for me to work out.五、it步状培从句1、定义:在旬中用来表示“退一步说”的句子叫让步状培 从句。2、常用引导词:although （虽然）二though （尽管，即使）,no matter+ U 间词二疑间词-ever （无论），eve

12、n if= even though （即 使）,whether. or .（不管是述是）等。3、时态：辻步狀培从句的时态一般采用主ilUil,主将卩、现 的原则。4、让步状培从句的注意点：1) although/ though不可与but连用(二者只选其一)，但可 与 still / yet 连用。©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 matte

13、r+疑问词二疑问词-ever “无论”(引导让步状 培从句可互换)(DWhatever (= No matter what) happened, he would not mind.Whoever (= No matter who) you are,you must keep the law.©However (=No matter how) expensive it may be, Til take it.注意:-nomattersfri词叫舌构只能引导It步状培从句，而“疑 间词-ever-3可以引导名词性从句(主培从旬，宾培从旬,表培 从旬和同位语从句)o Til eat wh

14、atever (fno matter what) you give me.(whatever引导宾语从句)©Whoever (力io matter who) comes will bewelcome, (whoever引导主培从旬)穴、条件状培从句1、定义：由引导词if或unless引导的狀培从句叫做条件狀语 从句。2、常用引导词:if（JDM,unless = if.not（如果不/ 除非）,so/as long as（只要）3、时态:条件狀培"、句的时态常采用主将从现原则。 I will come to see you if I have time Let's

15、go out for a walk unless you are too tired.=Let's go out for a walk if you are not too tired.（§） You can1t learn English well unless you work hard.=You cairt leam English well if you don't work hard. You may borrow my book as long as you keep it clean.注意广祈使旬，+and/or+简单旬"是一个固定旬型，这里祈 便句相当于一个由if引导的条件状用and引导的简单句 常表示一个较好的結果，用01引导的简单旬常表示一个不愉快 或不理想的结果；谓语动词常用一般将来Wo fill: 祈使旬，and +简单句（一般将来时）=If you do sth, you, 11 do sth. （这个句型表示“如果做到了祈使句表示的事情，就会有后面旬子 表示的结果”。）Think hard , and yoi