并列連詞

用法

例句

and

表并列或順承關(guān)系

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

用于“祈使句，and +陳述句”結(jié)構(gòu)

Be careful, and you will make fewer mistakes.

or

意為“或者”，表示任選其一

Do you want to go the zoo or the museum?

意為“否則”，用于“祈使句，or +陳述句”結(jié)構(gòu)

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

so

表示因果關(guān)系

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

for

表示原因，及附帶理由

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

連詞短語

意義用法

例句

neither--nor-

既不--也不,謂語動詞的數(shù)遵循“就近原則”

Neither he nor his children like fish.

either--or--

或者--或者--，謂語動詞的數(shù)遵循“就近原則”

Either you or he is wrong.

both--and--

兩者都，謂語動詞用復(fù)數(shù)形式

Both she and I are good at English.

not only-- but also

不但--而且-，謂語動詞的數(shù)遵循“就近原則”

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

從屬連詞

用法

例句

when

當(dāng)--時(shí)候

引導(dǎo)的從句中，謂語動詞可以是短暫性動詞也可以是延續(xù)性動詞

It was raining when he came out of the office.

while

當(dāng)--時(shí)候

引導(dǎo)的從句中，謂語動詞必須是延續(xù)性動詞，且常用進(jìn)行時(shí)

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

before

在--之前

“在……之前”，從句的動作通常發(fā)生在主句動作之后

She reached the train station before he called her yesterday.

after

在---之后

“在……之后”，從句的動作通常發(fā)生在主句動作之前

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

until

常用在“not...until...”結(jié)構(gòu)中，表示“直到……才……”

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

as

一邊--一邊

表示一件事情在發(fā)生，另一件事情也在同時(shí)發(fā)生

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

as soon as

一--就--

表示從句的動作一發(fā)生，主句的動作就隨之發(fā)生

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

since

自從

從句常用一般過去時(shí)，主句用現(xiàn)在完成時(shí)

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

once

一旦

表示從句動作一發(fā)生，主句的動作就隨之發(fā)生

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

連詞

用法

例句

if

如果

主句用一般現(xiàn)在時(shí)，主句通常用一般將來時(shí)，即主將從現(xiàn)，但有時(shí)用主情從現(xiàn)或主祈從現(xiàn)。

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

主句用一般現(xiàn)在時(shí)，主句通常用一般將來時(shí)，即主將從現(xiàn)，但有時(shí)用主情從現(xiàn)或主祈從現(xiàn)。。

unless可轉(zhuǎn)化成if--not結(jié)構(gòu)。

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

主句用一般現(xiàn)在時(shí)，主句通常用一般將來時(shí)，即主將從現(xiàn)。

You can take any book as long as you like.

連詞

意義

例句

because

表示造成某種情況的直接原因，語氣最強(qiáng)，常用來回答由why引導(dǎo)的問句，其從句的位置通常在主句的后面。

He has to leave because it is too late.

因?yàn)樘�晚了，他不得不走�?/span>

since

since語氣比as稍強(qiáng)，不表示直接的或根本的原因，而是一種已知的或非常顯然的理由，since引導(dǎo)的從句通常位于主句之前。

Since everyone is here, let’s start.

既然大家到齊了，我們就出發(fā)吧！

as

as是從屬連詞，表示原因時(shí)，語氣最弱，所說的原因比較明顯或是已知的事實(shí)，它引導(dǎo)的從句一般位于主句之前。

We all like her as she is kind.

我們都喜歡她，因?yàn)樗�善良�?/span>

連詞

意義

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.

連詞

意義

用法及例句

so --that

如此--以至于

so后跟形容詞副詞原形。(so--that--結(jié)構(gòu)常與too--to結(jié)構(gòu)轉(zhuǎn)化）。

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

such --that

such后跟名詞或名詞性詞組。

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

連詞

意義

用法

so that

以便于，為了

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

in order that

為了