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高二英语选修三第二单元知识点

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学习是一个坚持不懈的过程,走走停停便难有成就。比如烧开水,在烧到80度是停下来,等水冷了又烧,没烧开又停,如此周而复始,又费精力又费电,很难喝到水。以下是小编给大家整理的高二英语选修三第二单元知识点,希望大家能够喜欢!

高二英语选修三第二单元知识点1

一、引导主语从句的连词主要有:

从属连词:that whether

连接代词:who whoever whom whose what whatever which whichever

连接副词:when where how why

二、用法

主语从句是在复合句中充当主语的从句,通常放在主句谓语动词之前或由形式主语it代替,而本身放在句子末尾。

1. It 作形式主语和it引导强调句的比较

①主语从句常用it作形式主语,一般常用句型为:It is+{名词/形容词/过去分词}+主语从句例如:

It is still a question whether she will come or not.

It is strange that you should like him.

It is still unknown which team will win the match.

另外,还有一些比较多见的结构:

It turned out that……;

It has been proved that……;

It happened/occurred that……;

It is well-known that……等等

②而强调句则不同,它的结构是:It+be+被强调部分+that+从句

强调主语:It is the times that produce their heroes.时势造英雄

强调宾语:It is English that Prof.Lin teaches us.

强调状语:It was in shanghai that I saw the film.

判断是否是强调句有一个方法,就是将that以后的“句子的其余部分”拿出来单独看,看有没有缺成分,缺的是什么成分,再把谓语动词后面that前面的那部分,带到你认为缺成分的地方,如果放进去是一句完整的句子了,那就说明是强调句。

2. 用it 作形式主语的结构

(1) It is +名词+that从句

It is a fact that … 事实是……

It is an honor that …非常荣幸

It is common knowledge that …是常识

(2) it is +形容词+that从句

It is natural that… 很自然……

It is strange that… 奇怪的是……

(3) it +不及物动词+that从句

It seems that… 似乎……

It happened that… 碰巧……

(4) it is+过去分词+that从句

It is reported that… 据报道……

It has been proved that… 已证实……

3.主语从句不可位于句首的五种情况

(1) if引导的主语从句不可居于复合句句首。

(2) It is said , (reported) …结构中的主语从句不可提前。例如:

It is said that President Jingo will visit our school next week.

(3) It happens…, It occurs… 结构中的主语从句不可提前。例如:

It occurred to him that he failed in the examination.

(4) It doesn’t matter how/whether …结构中的主语从句不可提前。例如:

It doesn’t matter whether he is wrong or not..

(5) 含主语从句的复合句是疑问句时,主语从句不可提前。例如:

Is it likely that it will rain in the evening?

4. What 与that 在引导主语从句时的区别

What 引导主语从句时在从句中充当句子成分,如主语.宾语.表语,而that 则不然。例如:

What you said yesterday is right.

三、宾语从句用以区分主语从句的几个特征

1、引导词:what which whose when whet herif where

2语序:宾语从句必须是用陈述语句。(名词性从句都是陈述语序)

如:I think that you must work harder.

宾语从句的引导词、连接词的区别、否定转移等现象。

补充:从句的语序永远是陈述句。

高二英语选修三第二单元知识点2

【First aid知识点】

1. first aid 的意思是“急救”,例如:first aid to the injured 给予伤员的急救。

短语联想:

give/offer aid 援助 come to sb's aid 帮助某人

teaching aids 教具 medical aid 医疗救护

with the aid of 借助于

get injured 受伤,在现代英语中大量地出现了由“get + 及物动词不达意的过去分词”构成的被动语态,这叫 get - 型被动语态。又如:

The computer got (was)damaged when we were moving. 我们搬家的时候,电脑碰坏了。

高二英语选修三第二单元知识点3

Worried about the journey, I was unsettled for the first few days.

Well-known for their expertise, his parents’ company …..

Confused by the new surroundings, I was hit by the lack of fresh air.

Exhausted, I slid into the bed and fell fast asleep.

过去分词作状语:过去分词作状语时,说明动作发生的背景或情况,其等同于一个状语从句。vt 过去分词作状语时与主句主语构成被动关系,表示被动和完成,vi 过去分词表示状态或动作的完成。

Heated , water changes into steam .

The professor came in, followed by a group of young people .

1 作原因状语,等于as / since / because 引导从句

Moved by what she said ,we couldn’t help crying . = ( As we are moved by what she said …

2 作时间状语,等于when 引导时间从句,如果分词表示的动作与谓语的动作同时发生,可在分词前加when/ while / until 等使时间意义更明确。

When heated , water can be changed into steam .

Seen from the hill ,the park looks very beautiful .= ( When the park is seen from the hill…

3 作条件状语等于 if / whether 引导从句

Given more attention , the cabbages could have grown better .= ( If they have been given more attention ….

Compared with you , we still have a long way to go = ( If we are compared with you

4 作方式或伴随状语

The actress came in , followed by her fans .

She sat by the window , lost in thought .

5 作让步状语

Much tired ,he still kept on working .=(Although he was tired ,) he ….

6 独立主格结构: 当分词的逻辑主语不是主句主语时,分词可以有自己独立的逻辑主语,这种结构称为独立主格结构。常用来表示伴随情况。

The boy rushed into the classroom , his face covered with sweat .

All things considered ,your article is of great value than hers .

Rewrite with proper conjunctions

Example : United we stand, divided we fall.

If we are united, we will stand, but if we are divided,we will fall.

1 Asked what had happened, he told us about it.

→When he was asked what had happened, …

2 Well known for his expert advice, he received many invitations to give lectures.

→Because he was well known for his expert advice, …

3 Given more time, we would be able to do the work much better.

If we were given more time,

4 Once translated into Chinese, the book became very popular among Chinese teenagers.

Once it was translated into Chinese,

5 Deeply interested in medicine, she decided to become a doctor.

Because she was deeply interested in medicine,

6 Left alone at home, Sam did not feel afraid at all.

Although he was left alone at home,

现在分词与过去分词作状语

现在分词作状语时,与其逻辑主语之间是主动关系,;而过去分词与其逻辑主语之间则表示被动关系。

Seeing these pictures, I couldn’t help thinking of those days when I was in Beijing . Seen from the top of a thirty-storeyed building, Beijing looks more magnificent. (see)

选择现在分词还是过去分词,关键看主句的主语。如分词的动作是主句的主语发出,分词就选用现在分词,反之就用过去分词。例如:

Used for a long time, the book looks old.

由于用了很长时间,这本书看上去很旧。

Using the book, I find it useful.

在使用的过程中,我发现这本书很有用

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高二英语选修三第二单元知识点

学习是一个坚持不懈的过程,走走停停便难有成就。比如烧开水,在烧到80度是停下来,等水冷了又烧,没烧开又停,如此周而复始,又费精力又费电,很难喝到水。以下是小编给大家整理的高二英语选修三第二单元知识点,
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