Singular (1)

a teacher.

a student.

a dog.

a child.

a man.

a woman.

happy.

sad.

angry.

hungry.

tired.

I was (not)

You were (not)

He was (not)

She was (not)

It was (not)

Plural (2,3...)

teachers.

students.

dogs.

children.

men.

women.

happy.

sad.

angry.

hungry.

tired.

We were (not)

You were (not)

They were (not)