并列句(compound sentence)指的是由两个或两个以上的简单句并列在一起构成的句子。并列句的通常结构是：简单句+并列连词+简单句。其中的简单句通常被叫做分句。并列连词之前可用逗号，也可不用逗号。如：　　
He drank beer, and it made him fat. 他喝啤酒，因此发胖了。(并列连词是and)　　
He was ill for a week, and during that week he ate nothing. 他病了一星期，在那一星期里他什么也没吃。(并列连词是and)　　
Stephen realized his mistake and he apologized at once. 斯蒂芬认识了他的错误，于是马上道歉。(并列连词是and)　　
Stop the child or he will be falling over. 制止那孩子，要不他会掉下去。(并列连词是or)　　
He speaks French, or perhaps he understands it. 他会讲法语。或者他懂法语。(并列连词是or)　　
Would you advise phoning, or shall I wait a bit longer? 你看我打电话好，还是我再等一会儿好? (并列连词是or)　　
I waited but he never turned up. 我等着，可他根本没有来。(并列连词是but)　　
Tom is fairly clever, but Peter is rather stupid. 汤姆相当聪明，而彼得就颇笨。(并列连词是but)　　
Tourists come here but few stay overnight. 有游客到这里来，但很少有人过夜。(并列连词是but)　　
He gets a lot of letters but she doesn’t get many. 他收到的信很多，可她的信不多。(并列连词是but)　　
We rarely stay in hotels, for we can’t afford it. 我们很少住旅馆，因为我们住不起。(并列连词是for)　　
He was busy packing, for he was leaving that night. 他那时正忙着打点行李，因为那天晚上他就要走了。(并列连词是for)