This is a knife.（改为复数句） Is there a glass on the

题目

This is a knife.（改为复数句） Is there a glass on the
This is a knife.（改为复数句）
Is there a glass on the desk?(改为复数句)
Ther are apples.（改为单数句）

答案

These are knives.
Are there glasses on the desks?
This is an apple.