Question

как правильно  вставить am, am not,is, isn't,are, aren't

Answer 1

I- am
He- is
She- is
It- is
You- are
We- are
They- are
Пример i am a pupil
He is a pilot
We are students
You are a teacher
They are workers

Not- отрицательная частица. Ставится после глаголов am,is,are и строит отрицательное предложение:
I am not a pilot
You are not a student
He is not a doctor
We are not workers
Часто в отрицательных предложения употребляется сокращенная форма глагола :
Is not- isn't
Are not- aren't
Am not- aren't