连词的概述
连词，是一种虚词，不能担任一个句子成分，但可以起连接的作用，即连接词与词或句与句。例如：
We may be leaving today or tomorrow. 我们可能今天或明天走。(连接词与词)
Now I must go or I shall be late for the party. 我现在得走，否则晚会我就要迟到了。(连接句与句)
主要是包括并列连词和从属连词。在句子中，连词起连接词与词、短语与短语及句子和句子的`作用。它本身在句子里不单独做句子成分。
并列连词：是用来连接语法地位相同的结构、相同的单词、短语及句子。
并列连词有：and, but, or, nor, so, for yet, however, as well as, , not also, , , still,
从属连词：用来引导状语从句。
从属连词有：after, when, before, as, while, since, until, till, if, unless, lest, because, than, that, whether, so that, in order that, as if, as though, although, suppose that, provided, that, , now that, , in case that, on condition that
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