(完整版)as引导定语从句

as引导的定语从句as 引导的定语从句as引导非限制性定语从句，可放在主句之前，或者主句之后，甚至可以切割一个主句。

1.as 引导限定性定语从句as引导限定性定语从句，主要用在such... as（正如）和the same as（正像）的结构中，可代替表人或物的先行词，注：在same... as结构中as也可用that代替。

A.There is such an unforgettable experience as they have.他们有着如此难忘的经历。

（此such... as 结构中，as后的句子修饰限定experience，as作宾语）B.Nobody will obey such a rule as prevents us from free.没有人会遵守这项阻止我们追求自由的规定（as 在这里作主语）C.I have never seen such a beautiful girl as she is.我从来没有见过像她这样漂亮的女孩。

（as 在此处作is 后的表语）D.This is the same name as I have heard.这个名字和我之前听过的一样。

（as作宾语）2.as引导非限定性定语从句as引导非限定性定语从句时可放在主句之前，也可位于主句之后，当然也可放在句中。

此时修饰的是整个主句，并对其进行说明。

通常在as之前有逗号。

A.Thanksgiving day has been a international festival,as we know.正如我们所知道的那样，感恩节已经成为了一个国际性的节日。

（as引导的从句修饰前面的主句，放在句后）B.As is a successful man,he makes a brilliant speech.他正如一个成功男士发表精彩的讲话。

（as引导的句子放在句前，作主语）定语从句中as的用法1.准关系代词as引导限制定语从句，用于以下3个结构中，as在从句中作主语、宾语或表语：a.so / such…asSuch people as were mentioned by him were honest. (as作主语)I’ve never seen such a clever man as he is. (as作表语)Last term our maths teacher set so difficult an (= such a difficult) examination problem as none of us worked out.b.the same…asModern statemen are often faced with the same problem as defeated the ancient Romans. (as 作宾语)I like the same book as you do. (as 作宾语)c.as…asAs many children as came were given some cakes. (as 作主语) He is as diligent a man as ever lived. (as 作主语)补充：a.such…as 与such…that的区别such…as 引导定语从句；such…that引导结果状语从句。

as引导的定语从句
1. as soon as（一…就…）：引导一个时间性定语从句。

例如：I will call you as soon as I finish my work.（我一做完工作就给你打电话。

）2. as long as（只要）：引导一个条件性定语从句。

例如：You can borrow my car as long as you promise to drive carefully.（只要你答应小心驾驶，你可以借用我的车。

）
3. as far as（就…而言，就…而论）：引导一个程度或范围的定语从句。

例如：As far as I know, he is still living in New York.（就我所知，他仍然住在纽约。

）
4. as well as（和…一样；不仅…而且）：引导一个并列关系的定语从句。

例如：He speaks French as well as English.（他不仅会说英语，还会说法语。

）
5. as if / as though（好像；仿佛）：引导一个比拟关系的定语从句。

例如：She looks as if she hasn't slept for days.（她看上去好像已经好几天没有睡觉了。

）。

as用在定语从句中的用法一、AS用在定语从句中的基本用法与关系代词用法区别在英语中，定语从句通常由关系词引导。

这些关系词包括that、who、whom、whose和which等。

然而，在某些情况下，我们可以使用介词as来引导定语从句，表示“...的”。

本文将介绍AS在定语从句中的基本用法，并与其他关系代词进行比较。

1. AS作为关系代词引导定语从句AS在定语从句中可以指人或物。

当AS引导的定语从句修饰人时，作为主格或宾格，它可以替代一个具体名词或指示形容词短语。

例如：- She works as a teacher, which I admire.（她是一名教师，我很钦佩）- My neighbor's son, as I previously mentioned, is a doctor.（我之前提到过的邻居儿子是医生）2. AS和WHEN对时间进行修饰除了指人之外，AS还可用于修饰时间的定语从句。

它可以替代表示具体时刻或事件的名词。

例如：- September 4th, as you might remember, was our wedding anniversary.（9月4日是我们的结婚纪念日，你可能记得）- He always wakes up early, as his alarm clock rings.（当闹钟响起时，他总是醒得很早）3. AS和THAT的区别AS所引导的定语从句与由THAT引导的定语从句在用法上有所不同。

AS常用于对一个已知事实或情况进行补充说明，而THAT更常用于简明地陈述或描述事实。

例如：- He referred to the book as a valuable resource.（他把这本书称为宝贵的资源）- The fact that he won the award surprised everyone.（他获奖的事实让所有人都感到惊讶）二、AS用在定语从句中的扩展应用除了上述基本用法之外，AS还有一些特殊的扩展应用，我们将在以下几个方面进行讨论。

As引导从句归纳总结一、as引导定语从句一）as引导限制性定语从句主要结构有：the same…asas…assuch…asso…as主句中出现the same, as, such, so修饰先行词，需选择as做关系代词在定语从句中做主语或宾语。

1. It’s the same person as we wanted to find yesterday .我们昨天要找的是同一个人。

2. Such girls as he knows are good at English .他所认识的女孩都擅长英语。

3. Do you have such books as we like ?你有我们喜欢那种书吗？4. She will marry as healthy a man as she can find .她将嫁给她能找到的任何一个有钱人。

5. There is so warm a house as we want to live in .这里有如此暖和的房子，我们都想住在里面。

6. He has so difficult a problem , as none of us can solve .他有如此难的一个问题，我们没有人能解决。

二）引导非限制性定语从句1. as引导非限制性定语从句，指代整个主句内容，从句可置于句首，句中或句尾1) As everyone knows ,China is a beautiful country with a long history .每个人都知道，中国是一个有着悠久历史的美丽国家。

2) The earth , as we know , moves round the sun .地球，我们都知道，围着太阳转。

3) Tom works hard and is willing to help others, as we all know.汤母工作努力，并且乐于助人，这一点我们都知道。

as引导的定语从句(1）as引导的定语从句修饰表人或物的先行词，即先行词可以是人也可以是物；在定语从句中可以做主语、宾语或表语；常用于the same…as…/such…as…/as(so）…as…句型，as不论在定语从句中作何成分,均不能省略。

①Such teachers as know Tom think him bright。

先行词为人such teachers， as作主语②I’ll buy the same bike as I lost yesterday。

先行词为物the same bike,as作宾语，指同一类事物※此时注意和the same … that …引导的定语从句的区别It’s the same bike that I lost yesterday。

that引导定语从句，作宾语，指同一个事物※She wore the same dress that she wore at Mary's wedding. (the same…that…特指同一个)她穿着她在Mary婚礼上穿过的同一条裙子。

She wore the same dress as her young sister wore。

（the same…as …泛指同一类)她穿着和她妹妹所穿的一样的裙子。

That is the same watch as I lost. 那块手表和我丢失的一模一样。

（the same…as …泛指同一类)That is the same watch that I lost. 那就是我丢失的那块手表。

（the same…that…特指同一个）③The school is just the same one as it was 10 years ago.先行词为物the same one (school), as作表语It’s so heavy a box as no one can lift。

定语从句as的三种用法定语从句 "as" 有以下三种用法：1. 引导限制性定语从句：这种用法中，as在从句中作主语、宾语或表语。

例如：The car, as you know, cost me a lot of money. (你知道，那辆车花了我很多钱。

)I'll take the book, as you suggested. (按照你的建议，我会拿那本书。

)The child, as is well known, needs love and care. (众所周知，那个孩子需要爱和照顾。

)2. 引导非限制性定语从句：这种用法中，as在从句中作主语、宾语或表语。

例如：My sister, as you know, is a doctor. (你知道，我姐姐是一名医生。

)The book, as I have said, is very interesting. (正如我所说的，这本书非常有趣。

)The film, as you can imagine, was very emotional. (正如你可以想象的，这部电影非常感人。

)3. 引导方式状语从句：这种用法中，as在从句中作方式状语，表示“正如”、“就像”的意思。

例如：He did it, as we had expected. (他按照我们预期的那样做了那件事。

)She spoke to the camera, as if she was addressing a crowd of people. (她对着镜头讲话，就像是在向一群人发表演讲一样。

)。

定语从句中用as的四种情况1、当as引导表示方式的定语从句时：例如：He spoke in a low voice, as if he was too timid to make himself heard. 他说话语气低沉，好像害怕自己的声音太小无法被听见一样。

2、当as引导表示程度的定语从句时：例如：The mountain was as high as a castle. 这座山就像一座城堡一样的高。

3、当as引导表示身份的定语从句时：例如：We invited her to the party as our teacher. 我们邀请她以老师的身份参加派对。

4、当as引导表示比喻的定语从句时：例如：The dream dissolved as quickly as smoke. 梦境瞬间消散就像烟一样。

as作为连词在定语从句中最常见的四种用法就是上述所列，那么我们来简单说一下这四种情况下as的用法。

首先，当as引导表示方式的定语从句时，它和like意思相近，表示“仿佛”的意思，此时，as后一般接着一个由介词短语、形容词、动词等构成的状语从句；其次，当as引导表示程度的定语从句时，表示“一样”的意思，此时，as后一般接着一个定义词性短语，比如形容词、名词、副词、介词短语等，来表示“等于”的意思；然后，当as引导表示身份的定语从句时，它表示“作为”的意思，它后面接一个由介词短语、限定词性短语等构成的状语从句；最后，当as引导表示比喻的定语从句时，它表示“像”的意思，它后面一般接一个相对定的比较概念，以表示“就像”的意思。

以上就是as在定语从句中所涉及的四种情况，大家可以通过记住它们的具体结构，以及后面的接法来不断积累，从而掌握它们的用法。

只要结合例句，多加练习，一定可以掌握它们并能运用得熟练。

as 引导定于从句：1、as用作关系代词和关系副词引导限定性定语从句，并在从句中做主语、表语和状语，构成the same ...as, such...as等结构。

Eg: I have got into the same trouble as you.2、as引出非限定性定语从句时，代替整个主句，对其进行说明。

但通常用于：（as we all know, as it is known, as is known to all, as it is, as is said above, as always mentioned above, as is usual, as is often the case, as is reported in the newspaper) .as在非限定性定语从句中作主语、表语或宾语，且引出的从句位置比较灵活，可位于句首或句末，也可置于主句中间。

通常均由逗号将其与主句隔开。

as有“正如……，就像……”之意。

Eg:As is known to the United States, Mark Twain is a great American writer. 美国人都知道,马克·吐温是一位伟大的美国作家（as在从句中作主语）He forgot to bring his pen with him, as was often the case.他忘了带笔，这是常事。

（as在从句中作主语）He is absorbed in work, as he often was.他正在全神贯注地工作，他过去经常这样。

（as在从句中作表语）As we all know, the earth is round.众所周知，地球是圆的。

（as在从句中作宾语）The two brothers were satisfied with this decision, as was agreed beforehand.两兄弟对此决定都满意，这项决定在事前都已得到他们的同意。

as引导定语从句的用法as 引导非限制性定语从句，可放在主句之前，或者主句之后,甚至可以切割一个主句;which引导的非限制性定语从句只能放在主句之后。

另外，as有“正如……，正像……"的意思(1） As is known to all， China is a developing country。

(2） He is from the south, as we can see from his accent.（3） John， as you know， is a famous writer。

(4）He has been to Paris more than several times, which I don’t believe.================================As 的用法例1. the same… as；such…as 中的as 是一种固定结构，和……一样…….I have got into the same trouble as he （has）。

例2。

as可引导非限制性从句,常带有’正如’.As we know， smoking is harmful to one's health。

As is known, smoking is harmful to one’s health.As是关系代词。

例1中的as作know的宾语;例2中，它充当从句的主语，谓语动词know要用被动式.一、“as / which" 特殊定语从句的先行成分1. 形容词或形容词短语作先行成分, 具有形容词意义的介词短语也可以充当先行成分，如:My grandmother's house was always of great importance to me, as my own is.在一定的语言环境里，有些名词可以具有形容词的性质。

这些名词主要是那些表示人的身份、职业、状态的名词.值得一提的是，在这些具有形容词性质的名词之后，引导定语从句的关系代词不能用who / whom。