连词(conj conjunction)是虚词，仅用于连接词、短语或句子，不单独担任句子成分。连词主要分为并列连词、转折连词、选择连词和因果连词。并列连词包括并列连词和从属连词。以下详细讲解：

并列连词用于连接对等关系的词、短语或句子，如“and”、“both…and…”，“neither…nor…”和“not only…but also…”。

“and”表示“和”、“并且”，连接字、片语和句子。如：“I enjoy basketball , football and table tennis.”、“The weather becomes colder and colder.”。

“both…and…”表示“既…也…”，主语用复数谓语动词，如：“Both Jim and Kate are from England.”和“Both my father and my mother aren’t doctors.”。

“neither…nor…”表示“既不…也不…”，谓语动词遵循就近原则，如：“Neither I nor he has seen the play before.”。

“not only…but also…”表示“不但…而且…”，谓语动词遵循就近原则，如：“Not only the mother but also the children are ill.”。

转折连词如“but”, “however”, “yet”, “still”, “while”等，表示句与句之间的转折关系。例如：“Mary was a nice girl, but she had one shortcoming.”和“Jane is hard working ,while her sister is quite lazy.”。

选择连词如“or”, “either…or…”和“whether…or…”等，用于连接两个选项。例如：“He doesn’t like dumplings or noodles.”和“Either you or I am right.”。

因果连词如“for”, “so”等，表示句子间因果关系。例如：“It was late, so I went home.”和“He is not at school today, for he has a bad cold.”。

时间状语从句的引导词有“before”, “after”, “when”, “while”, “as”, “till”, “until”, “since”, “as soon as”等。例如：“We have learned six lessons since he began to teach us.”和“Mr. Green waited until his children came back.”。

条件状语从句的引导词有“if”和“unless”等。例如：“If you don’t go soon, you’ll be late.”。

原因状语从句的引导词有“because”, “as”和“since”等。例如：“He didn’t go to school because he was ill.”和“Since everybody is here, let’s begin.”。

让步状语从句的引导词有“although/though”和“even though/if”等。例如：“Although/ Though it is a very young country, it is very rich.”和“Even if/ though you were here yesterday, you couldn’t help him.”。

目的状语从句的引导词有“so that”和“in order that”等。例如：“The teacher spoke loudly so that /in order that we could hear him clearly.”。

结果状语从句的引导词有“so that”和“so/such…that…”等。例如：“It was very cold, so that the water in the bowl froze.”和“He got there so early that he got a good seat.”。

比较状语从句的引导词有“as…as…”、 “not as/so… as…”和“than”等。例如：“I can’t run as/so fast as you.”和“I know you better than she does.”。

名词性从句的引导词有“that”和“if/whether”等。例如：“We know that the earth goes around the sun.”和“I wonder if he has received my e-mail.”。

在时间状语从句和条件状语从句中，如果主句是将来时，从句要用一般现在时。例如：“I’ll go on with the work when I come back tomorrow.”和“He won’t come unless he is invited.”。

本文内容源自网络公开资源，仅用于学习交流，非商业用途，如侵权请删。