八年级英语下册Review of units 4--5知识讲解

编辑:chenc

2011-04-29

Review of units 4--5

一. 重点词汇短语

1. as well as

as well as同,和,也;既……也……。

如:

John can speak Chinese as well as French. 约翰会说法语,也会说中文。

It is important for you as well as for me. 它不仅对我重要,对你也是一样。

We shall travel by night as well as by day. 我们白天、晚上都要赶路。

as well 在口语中用得很多,用法和 too 完全一样,可以互换,通常位于句末。

如:

She not only sings also plays the piano as well. 她不但会唱歌,而且会弹钢琴。

I can do it as well. 这事我也能做。

2. “see sb. do sth.”意思是“看见某人做过什么”,它强调动作完成了,而“see sb. doing sth.” 意思是“看见某人正在做什么”,它强调动作正在进行。

例如:

I saw him crossing the street. 我看见他正在过马路。

I saw him cross the street. 我看见他过马路了。

I heard him singing in the next room. 我听见他在隔壁唱歌。

I heard him sing in the next room. 我听见他在隔壁唱歌了。

3. worth是一个只能作表语的形容词,意为“值……的”、“相当于……的价值的”。由于它类似介词,须后接名词或动名词(有被动的含义)作宾语。

如:

The used car is still worth $200. 这辆二手车依然值200美元。

Is the exhibition worth a visit/visiting? 这个展览会值得去参观吗?

It's not worth getting angry with him. 犯不着跟他生气。

It isn't worth waiting for him. 不值得等他。

4. when/while

when 既可用于一点时间(从句的谓语动词需用终止性动词), 也可用于一段时间(从句的动词用延续性动词), 从句与主句里面的谓语动词所表示的动作或状态能同时发生或一先一后分别发生。

例如:

He wants to help people when they are ill. 他想在人们生病时帮助他们。

When he got to Shanghai,the ship had already set off. 他到达上海时,轮船已经开走了。

while只能用于指一段时间(从句的谓语动词必须是延续性的),从句与主句里面的谓语动词所表示的动作只能同时发生, 不能一前一后发生。

例如:

One day while they were working in the fields,some farmers saw something strange in the sky. 有一天,一些农民在田间劳动的时候,看见空中有些奇怪的东西。

While I was reading,my mother was washing clothes. 我读书时,我妈妈在洗衣服。

这两个词还可以用作并列连词。when 是“在那时”或“这时突然”(and just at that time)的意思, 用来连接两个并列分句,有时 when分句前有逗号把前后两个分句分开。

例如:

An Arab was walking alone through the desert when he met two men.

有个阿拉伯人正独自在沙漠里行走,这时他碰见了两个人。

I stayed till sunset,when it began to rain. 我一直呆到太阳下山, 天开始下雨了。

while 意为“而,却”,表示对照关系。

例如:

Instead,he asked his father why he was not able to hatch chickens while hens could.

他反而问他父亲,为什么他不能孵出小鸡,而母鸡却能。

5. instead和instead of

instead是副词,意为“代替”,“顶替”,在句中作状语。

例如:

If you are busy,you may come another day instead. 要是你忙的话,就改日再来吧。

He never studies.Instead,he plays all day and all night. 他不学习,而整日整夜地玩。

instead of是介词短语,表示“代替”的意义时,常常和in place of互换使用,其后常可用名词、代词、动名词;instead of还含有“对比”的意思。

如:

Give me that dictionary instead of this one.把那本字典给我而不是这一本。(代替)

I want to fly to Being instead of taking a train.我想坐飞机去北京不想坐火车去(代替)

This book is dull instead of interesting. 这本书不但无趣,反倒枯燥无味。(对比)

In the morning,we get up early instead of late. 早晨我们起早不起晚。(对比)

6. be good for和be good at

be good for意为“有益于…”,“对…有用”,后面接名词、代词或动词的-ing形式;

be good at意为“在…方面好”,“擅长于”,后面也可接名词、代词或动词的-ing形式。

例如:

This medicine is good for fever. 这种药对治疗发烧有效。

This kind of wood is good for making boxes. 这种木料适合用来做箱子。

He is good at English. 他英语学得好。

Tom is good at swimming. 汤姆很会游泳。

7. too…to…意为“太……而不能”,表示否定。

如:

He is too excited to say a word.他激动得一句话也说不出来。

too…not to…意为“太……不能不”,表示肯定。

如:

You are too angry not to say it.你在气愤之下,不免要说出这样的话来。

He is too careful not to have noticed it. 他那么细心,不会不注意到这一点的。

This coffee is too hot not to drunk. 咖啡不是太烫,可以喝。

not too…to…意为“并非太…而不能”,表示肯定。

如:

His grandfather is not too old to do so.他祖父并非老到不能做这事。

二. 重点语法

Ⅰ. 直接引语和间接引语

直接引语变间接引语就是写成宾语从句或动词不定式短语,要注意以下几点:

人称变化、时态变化、时间以及地点变化。

在直接引语中 在间接引语中

指示代词 this

these that

those

时间状语 now

today

yesterday

last week

tomorrow

next year

a few days ago then

that day

the day before

the week before

the next day

the next year

a few days before

地点状语 here there

动词时态 一般现在时

现在进行时

现在完成时

一般过去时

过去完成时

一般将来时 一般过去时

过去进行时

过去完成时

过去完成时

(不变)

过去将来时

动词变化 will/may/can

must

come

bring would/might/could

had to

go

take

1. 直接引语是陈述句,变成间接引语,由连词that 引导。

例如:

The teacher said,“ I am very happy to hear the news.”

→The teacher said that he was very happy to hear the news. (注意人称、时态的变化)

2. 直接引语是一般、选择或反问疑问句,变成间接引语,由连词whether或if 引导。

例如:

He asked me,“Are you free tomorrow?”

→He asked me if/whether I was free the next day. (注意人称、时态及时间状语的变化)

3. 直接引语是特殊疑问句,变成间接引语,由相应的疑问词引导,如who,whom,what,whose,how,when, why,where等。

例如:

Jenny asked me,“ Where is Mary from?”→Jenny asked me where Mary was from.

(注意:间接引语一定要用陈述句的语序,即主、谓、宾的顺序。)

4. 直接引语是祈使句,变成间接引语,把动词原形变成动词不定式,并在动词不定前加tell,ask,order的宾语。

例如:

“Be careful”,the teacher said. →The teacher told us to be careful.

My teacher asked me, “ Don’t laugh.”→My teacher asked me not to laugh.

(注意:否定句,在动词不定式前加not)

5. 直接引语是客观事实、永恒真理,变成间接引语时,时态不变。

例如:

They told their son,“The earth goes round the sun.”

→They told their son that the earth goes round the sun.

Ⅱ. 现在进行时表示将来的时间

1. 用be doing表示将来:主要意义是表示按计划、安排即将发生的动作,常用于位置转移的动词,如:go,come,leave,arrive等,也可用于其他动作动词。

如:

We are having fish for dinner. 我们晚饭吃鱼。

We are moving to a different hotel the day after tomorrow. 后天我们会去另外一个旅馆。

这种用法通常带有表示将来的时间状语,如果不带时间状语,则根据上下文可表示最近即将发生的动作。

A: Where are you going?

B: I am going for a walk. Are you coming with me?

A: Yes,I am just coming. Wait for me.

2. 现在进行时表示将来和用be going to 表示将来意思比较接近,但是现在进行时更强调事先已安排好,即将去做的事情, 而be going to 一般只表示打算做某事,有做某事的意图。我们来看两个例子:

如:

She is having a meeting at 9 tomorrow. 她明天早晨9点有个会。

We are leaving for London next week. 我们下周出发去伦敦。

这两个句子里就是用现在进行时表示将来已经安排好要做的事情。

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