初中英语知识点:连词

并列连词

用法

例句

and

表并列或顺承关系

He came into the classroom and put his schoolbag on the desk.

用于“祈使句，and +陈述句”结构

Be careful, and you will make fewer mistakes.

or

意为“或者”，表示任选其一

Do you want to go the zoo or the museum?

意为“否则”，用于“祈使句，or +陈述句”结构

Please be quick, or we will miss the last bus.

so

表示因果关系

It’s raining heavily now, so we have to put off the P.E class.

for

表示原因，及附带理由

I must be off now, for it is getting late.

连词短语

意义用法

例句

neither--nor-

既不--也不,谓语动词的数遵循“就近原则”

Neither he nor his children like fish.

either--or--

或者--或者--，谓语动词的数遵循“就近原则”

Either you or he is wrong.

both--and--

两者都，谓语动词用复数形式

Both she and I are good at English.

not only-- but also

不但--而且-，谓语动词的数遵循“就近原则”

Not only you but also he wants to buy the book.

从属连词

用法

例句

when

当--时候

引导的从句中，谓语动词可以是短暂性动词也可以是延续性动词

It was raining when he came out of the office.

while

当--时候

引导的从句中，谓语动词必须是延续性动词，且常用进行时

Don't make any noise while others are reading in the library.

before

在--之前

“在……之前”，从句的动作通常发生在主句动作之后

She reached the train station before he called her yesterday.

after

在---之后

“在……之后”，从句的动作通常发生在主句动作之前

He turned off the light and went to bed after he cleaned the room.

until

常用在“not...until...”结构中，表示“直到……才……”

Nancy didn't appear until it was ten o'clock last night.

as

一边--一边

表示一件事情在发生，另一件事情也在同时发生

The students took notes as they listened to the radio in English class.

as soon as

一 --就--

表示从句的动作一发生，主句的动作就随之发生 

I'll write a letter to you as soon as I get to America.

since

自从

从句常用一般过去时，主句用现在完成时

The girl who can speak English smoothly has lived in London since she was five years old.

once

一旦

表示从句动作一发生，主句的动作就随之发生

Once they find people in trouble, they are eager to help them without payment.

连词

用法

例句

if

如果

主句用一般现在时，主句通常用一般将来时，即主将从现，但有时用主情从现或主祈从现。

1.If he has time tomorrow, he will come to the meeting.

2.None can succeed if he doesn’t work hard.

unless

除非，如果不

主句用一般现在时，主句通常用一般将来时，即主将从现，但有时用主情从现或主祈从现。。

unless可转化成if--not 结构。

1.He won’t finish the work unless he works hard.

2.If it doesn’t rain, go for a picnic.

as long as

只要

主句用一般现在时，主句通常用一般将来时，即主将从现。

You can take any book as long as you like.

连词

意义及用法

例句

though

虽然，尽管

引导让步状语从句时，

不能与but同时使用。

Although it was raining hard, he still went out.

although

even/ though if

即使

whatever

无论什么

等于no matter what

Whatever you may say, I will not change my mind.

whenever

无论什么时候

等于no matter when

Whenever you come to my home, I will treat you well.

连词

用法

例句

because

因为

表示某事件发生的直接原因，回答why引导的问句，不能与so连用。

He didn’t go to school because he had a bad cold.

since

既然

表示大家都知道的原因。

Since you have known it, I needn’t tell you about it.

as

由于，因为

表示因客观存在的情况，造成某事件的发生。

As it is very cold in Beijing in winter, you had better take more clothes.

连词

意义

例句

as

按照--方式

She always does as her father tells her.

as if

似乎，好像

He walked around as if he was looking for something.

连词

意义

用法及例句

so --that

如此--以至于

so 后跟形容词副词原形。(so--that--结构常与too--to 结构转化）。

She was so tired that she couldn’t go any farther

such --that

such后跟名词或名词性词组。

It’s such a fine day that many people go to the park for fun.

连词

意义

用法

so that

以便于，为了

They sped up so that they could get there on time.

in order that

为了