Be动词作谓语的句子一般现在时

问题描述:

Be动词作谓语的句子
一般现在时

I am a student.

There is a pen, a knife and several books on the desk..
There are twenty boy-students and twenty-three girl-students in the class.

多数句子都是
例如
I’m a good student.
This is my apple