英语中什么是从属连词

连词用于引导从句以形成句子的一部分或修饰句子的构成要素的叫作从属连词.由从属连词所引导的句子叫从句,而含有从句的句子叫作复合句.
连词是连接单词,短语,从句或句子的一种虚词.
从属连词这种连词是用以引导名词性从句和状语从句的.
在英语词类中，连接词可说是最容易掌握的一种。
从结构上说，英语连接词分两大类：并列连词（coordinating conjunctions）和从属连词（subordinating conjunctions）。

并列连词连接两个或两个以上地位平等的字、词组或分句。例如：(1) Air and water are indispensable to me.

(2) She likes going out with friends or playing outdoor games.

(3) Most workers have a good income, so they look very happy.

从属连词连接两个或两个以上的分句，形成复杂句中的从属分句。例如：

(4) He said that he did not want to go .

(5) Many things have happened since I last saw him.

(6) You may come if you want to.

上述连词的用法，看起来不难，但错误也难免。下面是些好例子：

(1) This book may be used both as a text as well as a reference book.

这里的“as well as”和“both”不能搭配，应该将“as well ”改为“and”，使“both.......and......”变成关联连词（ correlative conjunction）

(2) He not only speaks Mandarin but also English.