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2019大学英语六级语法常考知识讲解(第25讲)

2019大学英语六级语法常考知识讲解(第25讲)
2019大学英语六级语法常考知识讲解(第25讲)

2019大学英语六级语法常考知识讲解(第25讲)

定语从句

限制和非限制性定语从句:限制性定语从句是名词词组不可缺少的一个组成部分, 去掉了会造成病句或意义不明确; 非限制性定语从句属于补充说明性质, 去掉了不会影响主要意义, 通常用逗号与它的先行词分开.

The boys who wanted to play football were disappointed when it rained.

The boys, who wanted to play football, were disappointed when it rained.

如果定语从句的先行词是专有名词, 或是带有形容词性物主代词(my, his, etc)或形容词性指示代词(this, that, etc)作限定词, 其后的定语从句通常都是非限制性的:

Mary Smith, who is in the corner, wants to meet you.

Her mother, who had long suffered form arthritis, died last night.

All these books, which have been donated by visiting professors, are to be used by the postgraduates.

在非限制性定语从句中只能用who/whom指人, 用which指物,通常不用that替代.

My father, who had been on a visit to America, returned yesterday.

All the books, which had pictures in them, were sent to the little girl.

定语从句的引导词

that, who, whom:非限制性定语从句, 如果修饰人, 一般用who, 有时用that (作主语时用who较多). 如果关系代词在从句中作宾语, 就理应用宾格 whom 或that, 但在绝大部分情况下都能够省略掉, 在口语中可用who代替whom.

Here is the man (who m) you’ve been looking for.

He is a man (that) you can safely depend on.

The people (who/that) you were talking to were Swedes.

There are some people here who I want you to meet.

但在介词后只能用whom:

This is the man to whom I referred.

但在口语中一般都把介词放到句子后面去, 这时可用that, 但省略时更多一些.

Have you met the person about whom he was speaking?

Have you met the person (that) he was speaking about

The girl to whom I spoke is my cousin.

The girl (who/that) I spoke to is my cousin.

限制性定语从句如果修饰“物”, 用关系代词that的时候较多, 也有时用which.. 当这个代词在从句中是用作宾语时, 在绝绝大部分情况下都是省略的, 特别是口语中(尤其是当被修饰的词是all, everything等词时):

Have you everything you need?

(Is there) anything I can do for you?

All you have to do is to press the button.

在介词后只能用which, 在口语中一般都把介词放到从句后部去, 这时能够用that, 但省略的时候更多一些:

The tool with which he is working is called a wrench.

The tool (that) he is working with is called a wrench.

This is the question about which we’ve had so much discussion.

This is the q uestion (that) we’ve had so much discussion about.

定语从句一般是修饰名词或代词的, 但间或也能够修饰整个句子a), 或是句子的一部分 b), 引导词用which:

They have invited me to visit their country, which is very kind of them.

The activity was postponed, which was exactly what we wanted

When deeply absorbed in work, which he often was, he would forget all about eating and sleeping.

She was very patient towards the children, which her husband seldom was.

whose:在表示“...的”这个概念时, 可用所有格 whose; whose 用于指物, 有时可与of which交替使用, 通常的词序是名词词组 + of which:

Is there anyone in your class whose family is in the northeast?

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(1)由no matter + wh-疑问词【no matter what】和wh-疑问词+ever 【whatever】。但wh-疑问词+ever【whatever】引导的名词从句则不能用no matter替换。 Take the coat ,no matter what coat it is / whatever coat it is . (2)No matter whether…or…结构中可将no matter省略,形成whether…or…或whether…or not 引导选择条件句。 例;The substance does not dissolve in water whether {it is}heated or not。 2.条件状语从句 】 翻译条件状语从句时,要注意时态的选择。 例;Please come here at ten tomorrow morning if it is convenient for you。条件状语从句,用if引导;主句是祈使句,相当于将来时态,故从句应用一般现在时。 3. 时间状语从句 例;We do not know it until a doctor discovered it by chance。 4. 原因状语从句 常见引导原因状语从句的引导词有;because,as,now that/since, in that 等。 三.名词性从句 1. 主语从句 ) 汉语中的“的”字结构可译成英语的主语从句,用what引导,相当于the thing that。 例:What many people have not realized is that read books is a insteresting thing。 2. 表语从句 In my seventies,one change I notice is that I am more easily to get tired than before。

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