1.并列句的基本概念
并列句是由两个或两个以上并列而又独立的简单句构成的。在并列句中，这些简单句常由并列连词连在一起。并列连词所连接的简单句被称为分句。
2.常见的并列连词
(1)表示递进或顺承关系：常用的并列连词有and，not only...but (also)...等。
He had plenty of money and he spent it freely.
Not only did he speak more correctly，but also he spoke more easily.
(2)表示选择关系：常用的并列连词有or，either...or...等。
Either you are right，or I am.
(3)表示转折关系：常用的并列连词有but，yet，whereas等。
Jane said she was ill，yet I saw her in the street just now.
Some of the studies show positive results，whereas others do not.
(4)表示因果关系：常用的并列连词有so，for等。
It must have rained last night，for it is wet all over.
The shops were closed，so I didn’t get any milk.
(5)when还可用作并列连词，意为“那时，这时”，相当于and at this/that time。常用于下列句式：①sb. was doing sth. when...；②sb. was about to do/going to do/on the point of doing sth. when...；③sb. had just done sth. when...。
We were having a meeting when someone broke in.
We were about to set off when it suddenly began to rain.
(6)while作为并列连词，意为“而，却”，表示对比。
He likes pop music，while I am fond of folk music.
