Am/Is/Are - Be Form Verbs

"am" is used with the pronoun "I"

"is" is used with "he", "she", "it"

"are" is used with "we", "you", "they"

Eg: 

• I am a writer.

• He is a computer engineer.
• She is a professor.
• It is an artificial flower.

• We are sportsmen.
• You are an organizer of events.
• They are media personnel.

• Now look at the six forms of each sentence.

I am a writer. (positive statement)
I am not a writer. (negative statement)

Am I a writer? (positive question)
Am I not a Writer? (negative question)

I am a writer, aren't I? (negative tag question)
I am not a writer, am I? (positive tag question)

He is a computer engineer
He is not a computer engineer.
Is he a computer engineer?
Is he not a computer engineer?
He is a computer engineer, isn't he?
He is not a computer engineer, is he?

She is a professor.
She is not a professor.
Is she a professor?
Is she not a professor?
She is a professor, isn't she?
She is not a professor, is she?

It is an artificial flower.
It is not an artificial flower.
Is it an artificial flower?
Is it not an artificial flower?
It is an artificial flower, isn't she?
It is not an artificial flower, is she?

We are sportsmen.
We are not sportsmen.
Are we sportsmen?
Are we not sportsmen?
We are sportsmen, aren't we?
We are not sportsmen, are we?

You are an organizer of events.
You are not an organizer of events.
Are you an organizer of events?
Are you not an organizer of events?
You are an organizer of events, aren't you?
You are not an organizer of events, are you?

They are the media personnel.
They are not the media personnel.
Are they the media personnel?
Are they not the media personnel?
They are the media personnel, aren't they?
They are not the media personnel, are they?

Note: 1) The difference between positive statement and negative statement is usage of "not".
I am a writer. (positive) I am NOT a writer. (negative)

2) The difference between statements and questions is change of their placement of the 'subject' and 'be' form verb. I am a writer. Am I a writer.

3) a)The formation of question tag begins from the verb 
used in the sentence. He is an engineer, isn't he? 

One exception is that I am a doctor, aren't I? 

But I am not a doctor, am I? is right.

b)The tag ends with the subject of the sentence. I am a 
doctor, aren't I?

c) Negative tag to the positive statement. Positive tag to 
the negative statement.
He is an engineer, (positive) isn't he? ( tag negative) 
is + not =isn't.
He is not an engineer, (negative) is he? (tag positive)

EXERCISE

Complete the sentences with (am/is/are)

I ____ an artist.
____ I a student?
He ____ a spectator.
They are business men, ____n't they?
You ____ not a criminal.
We are not from Europe, _____ we?
_____ you a singer?
I am a dentist, ____ n't I?
He is a player from Asia, _____ n't he?
She ____ a vocalist.

KEY

1) am 2) Am 3) is 4) are 5) are 6) are 7) Are 8) are 9) is 10) is