Singular:

Subject + Be + Noun

I am a student   /   I´m a student

You are a student  /  You´re a student

He is a student  / He´s a student

She is a student  /  She´s a student

It is a flower  / It´s a student

Plural:

Student + Be + Noun

We are student´s  /   We´re student´s

You are student  /  You´re student

They are student  /  They´re student