什么是复数句

复数句就是主语是复数。单数句就是主语是单数。

例如：Three apples are on the table.

单数句： An apple is on the table

复数句就是做主语和宾语的名词，代词都用复数表达的句子.如：

This is a book .这是单数句，因为 this，a，book 指的都是单数.

改成复数句就是：

Thses are some e 是this 的复数 some books 是a book 的复数

There is a child.这是单数句 There are some children.

要注意因为主语改成了复数，所以谓语动词或be 动词也要变化，如：

He does his homework every day.改成复数句：

They do their homework everyday.(homework 是不可数名词，所以不变