并列句是由并列连词and，but，or，for，so等把两个或两个以上互不依从，但意思紧密联系的简单句连在一起而构成的句子。其结构为：简单句+并列连词+简单句。
Jim finished his homework and he went to bed.
1. 表示同等关系的并列句（联合并列句）
这类并列句常用并列连词and(和、并且),not only...but also... (不但……而且……) neither... nor... (既不......也不) both... and... (既......又)
等。
He likes playing football and he plays well。他喜欢踢足球，并且踢得很好。
Last year l met Kate and we became friends．去年我和凯特相遇，我们成了朋友。
Not only I come to school early, but also my teacher does. 不但我到校早,而且我的老师也是如此。
Not only I but also Jane and Mary are tired of having one examination
after another.
Neither they nor I like the film.
He is both clever and diligent.
English is both interesting and difficult. 英语既有趣又难学。
2．表示转折关系的并列句(转折并列句)
这类并列句常用并列连词but(但是)，yet(可是)，while(而，另一方面)，however(可是)等连接前后简单句，but常译为“但是”，“可是”，切不可与从属连词though或although一起使用。
She’s good at English, but her Chinese isn‘t good. 她擅长英语,但语文不好。
School is over, yet all the teachers are still working.学校放学了，可是老师们仍然在工作。
He worked hard, yet he failed. 他努力地干,然而失败了。
He wants to be a writer, while I want to be a scientist. 他想当作家，而我则想当科学家。