什么是简单句？ 只有一个主谓宾结构的句子：

They workedday and night.

I went and boughtsome fruit just now.

简单句和复合句的区别：

简单句只有一个主谓结构；而复合句包括两个或者两个以上主谓结构。

试比较：

she knewit.（简单句）

she has knownit and we needn‘t tell her about it.(复合句：并列句）

she knewthathe had come backfrom London.(复合句：宾语从句）

简单句的五种基本句型

1.“主语 谓语”（即“主谓”句型）

They workedday and night.

2.‘主语 谓语 宾语“（即”主谓宾“句型）

He raised his arms.

3.‘主语 系动词 表语“（即”主系表“句型）

I am a teacher.

4.”主语 谓语 间接宾语 直接宾语“（即”主谓双宾“句型）

Miss Zhang gave us an English lesson.

Miss Zhang gave an English lesson to us.

5.‘主语 谓语 宾语 宾语补足语“（即”主谓宾宾补“句型)

I heard her singingin the next room this time yesterday.