连词在句中不能单独作句子成分，只起连接作用，要连接平等的结构，即连接词与词、短语与短语或句子与句子。连词分为并列连词和从属连词。

并列连词

并列连词用来连接具有平行关系的词、短语或句子。常用的并列连词有：and，but，or，so，both…and，not only…but also，either…or，neither…nor等。

1．and “和，而且”，连接主语时谓语动词用复数。

My brother and I are students. 我哥哥和我都是学生。

2．or “和，或者”，表示选择，多用于否定句。连接主语时谓语动词由后者决定。

I don't like milk or coffee. 我不喜欢牛奶和咖啡。

3．but “但是”，表示转折。

I can swim, but I can't swim well. 我会游泳，但我游得不好。

4．so “所以，因此”，表示结果。

It's raining outside, so I have to stay at home. 外面下雨了，所以我只好待在家里。

5．both...and “两者都……”，连接主语时谓语动词用复数。

I can speak both Chinese and English. 我会说汉语和英语。

6．not only...but also “不但……而且”，连接主语时谓语动词由后者决定。

Not only he but also I like skating. 不但他而且我也喜欢滑冰。

7．either...or “或者……或者”，表示选择。连接主语时谓语动词由后者决定。

Either she or I have the chance to go abroad. 要么她要么我有机会出国。

8．neither...nor “既不……也不”，连接主语时谓语动词由后者决定。

Neither she nor I like Sports Shows. 她和我都不喜欢体育节目。

从属连词

从属连词用来连接主句和从句。常用的从属连词有：when，before，after，as soon as，because，if，though，although等。

1．when/while “当……时”，表示时间，引导时间状语从句。

When I got home, my mother was cooking. 当我到家的时候，妈妈正在做饭。

2．before “在……之前”，表示事情发生的先后顺序，引导时间状语从句。

I must get home before 5:00. 我5点之前必须到家。

3．after “在……之后”，表示事情发生的先后顺序，引导时间状语从句。

After I had breakfast, I went to school. 我吃完早饭后上学去了。

4．as soon as “一……就……”，表示时间，引导时间状语从句。

As soon as I get home, I will call you. 我一到家就给你打电话。

5．because “因为，由于”，表示原因，引导原因状语从句。

She isn't at school because she is ill. 因为她生病了，所以没上学。

6．if “如果”，表示条件，引导条件状语从句。

You will make progress if you work hard. 如果你努力就会取得进步。

7．though/although “虽然，尽管”，表示让步，引导让步状语从句。

Although/Though he is rich, he is unhappy. 虽然他很有钱，但是他不快乐。

在汉语中“因为……所以……”总是成对出现，

而在英语中because 不能和so 并用，二者只用其一。

Because I like music. I often go to concerts.

I like music. So I often go to concerts.

因为我喜欢音乐，所以我经常去听音乐会。

一、用适当的连词填空。

1．__________ it's raining, the match continues.

2．I'll telephone you __________I arrive in New York.

3．I was tired,__________I went to bed early last night.

4．Does he go to work by bike __________ by bus?

5．It is snowy __________ cold in winter.

二、请用括号里的连词连接下列句子。

1．She is poor. She is happy.(but)

2．He was tired. He couldn't walk there.(because)

3．He can play soccer. He can play basketball.(both…and)

4．It was dark. I couldn't see anything.(so)

三、选择合适的连词完成句子。

1．The shoes are nice,__________ they are a little small.(because, but)

2．I like volleyball __________ football.(and, or)

3．__________ you have any questions, please tell me.(But, If)

4．Turn off the lights __________ you leave the room.(so, before)

5．It is raining,__________I stay at home.(because, so)

一、1．Although/Though

2．as soon as

3．so

4．or

5．and

二、1．She is poor, but she is happy.

2．He couldn't walk there, because he was tired.

3．He can play both soccer and basketball.

4．It was dark, so I couldn't see anything.

三、1．but

2．and

3．If

4．before

5．so