连词是用来连接词，短语，从句或句子的词，连词不作成分。
1.表示并列关系的连词有：and, both…and…, not only… but also…和neither…nor…等
1)and：和，并且
A：基本用法：
“and”表示 “和”、“并且”的意思，用来连接对等关系的字和字，片语和片语，句子和句子。
I enjoy basketball , football and table tennis.
The weather becomes colder and colder.
B: 特别用法：
祁使句后连接and，有条件句作用，此时and=if you…,you’ll… Go straight on, and you’ll see the library.==If you go straight on, you will see the library.
2)both…and…既…也…,(两者)都…
A、both…and…构成的词组作主语时,谓语动词用复数。
Both Jim and Kate are from England.
B、both…and…否定句表示部分否定。
You can’t speak both German and English.
Both my father and my mother aren’t doctors.
3) neither…nor…:既不…也不…
neither…nor…连接两个并列主语时,谓语动词靠近哪个主语就与哪个主语保持 “人称”和 “数”的一致，即采取就近原则。
Neither I nor he has seen the play before.
4)not only…but also…:不但…而且…
not only…but also…连接两个主语后的谓语动词也遵循就近原则。
Not only the mother but also the children are ill.
2.表示转折关系的连词有：but, however, yet, still，while等。
Mary was a nice girl, but she had one shortcoming.
Tom got up early, yet he failed to catch the train.
He was very tired, still he kept on walking.
Your composition is fairly good, however, there is still some
room for improvement.
Jane is hard working ,while her sister is quite lazy.
3.表示选择关系的并列连词有：or, either…or…,whether… or…等。
1)or：或、否则
A:基本用法
or 表示 “或” 的意思，使用于两者之中选择一个的时候。
Is your friend English or American? ----American.
He doesn’t like dumplings or noodles.
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