简单句:只有一个主语(或并列主语)和一个谓语(或并列谓语)。
e.g. He often reads English in the morning.
并列句:由并列连词(and, but, or等)或分号(;)把两个或两个以上的简单句连在一起构成。
e.g. You help him and he helps you.
主从复合句:含有一个或一个以上从句的句子。主从复合句包含名词性从句(主语从句、宾语从句、表语从句和同位语从句)、定语从句和状语从句等。
e.g. The foreign visitors took a lot of pictures when they were at the Great Wall.