句子可以是简单的，复合的，复杂的或复合的。

简单句

简单的句子只有一个独立的句子。 没有从句，句子必须限于一个主语和一个谓语。

• Grammar class is boring. "Magma" is a French progressive rock band.

复合句

复合句由两个或多个独立的子句组成，这些子句由协调连词或分号连接。 在连接两个独立子句的任何协调连接之前，应始终使用逗号：

• Sissy likes "Magma," but she thinks grammar class is boring. Timmy likes grammar class, so he does not like "Magma."

复杂句

复杂句子使用一个独立的子句和一个或多个从属子句：

• When Sissy is in grammar class, she often dreams of the next Magma show. ("When Sissy..." is a dependent clause, "she often..." is an independent clause.)

复合句子

它应包含两个或多个独立子句和一个或多个从属子句：

• Magma sings in a language they created, and they feel that proper grammar has no place at their shows, which are often quite obnoxious.

progressive [prə´gresiv]   a.进步的；前进的   (高中英语单词)

dependent [di´pendənt]   a.依赖的；从属的   (高中英语单词)

clause [klɔ:z]   n.条(款)；分句，从句   (英语四级单词)