一. 并列句.用 and, but, or 等词连接.
Eg: 1.The workers felt tired, but they still went on working.
2.Be quick, or you’ll miss the train.
3.Spring is coming , and the trees are getting green.
4.They finished the work, then they went out for a walk.
二. 复合句----主从复合句,主要指宾语从句和状语从句把下列句子合并为一句.
.在know , ask, tell , find , think , say , hear 等词后做宾语.
