To Be - Affirmative

Subject	To Be	Examples
I	am	I am from New Zealand.
You	are	You are Chilean.
He	is	He is twenty years old.
She	is	She is a nurse.
It	is	It is a big dog.
We	are	We are intelligent.
You	are	You are students.
They	are	They are married.

To Be - Contractions

Contractions of To Be are very frequent when we are speaking.

To Be	Contraction	Examples
I am	I'm	I'm from New Zealand.
You are	You're	You're Chilean.
He is	He's	He's twenty years old.
She is	She's	She's a nurse.
It is	It's	It's a big dog.
We are	We're	We're intelligent.
You are	You're	You're students.
They are	They're	They're married.

To Be - Negative Sentences

The negative of To Be can be made by adding not after the verb.

Subject	To Be	Examples
I	am not	I am not from Spain.
You	are not	You are not Australian.
He	is not	He is not thirty years old.
She	is not	She is not a secretary.
It	is not	It is not a small cat.
We	are not	We are not stupid.
You	are not	You are not teachers.
They	are not	They are not single.

To Be - Negative Contractions

There are two ways of forming contractions of To Be in negative sentences. One is with a contraction of the subject and the verb (e.g. I am = I'm) OR a contraction of the verb and not (e.g. are not = aren't)

I'm not from Spain.	---	--------------*
You're not Australian.	OR	You aren't Australian.
He's not thirty years old.	OR	He isn't thirty years old.
She's not a secretary.	OR	She isn't a secretary.
It's not a small cat.	OR	It isn't a small cat.
We're not stupid.	OR	We aren't stupid.
You're not teachers.	OR	You aren't teachers.
They're not single.	OR	They aren't single.

* Notice that the only possible contraction for I am not is I'm not.

To Be - Questions

To create questions with To Be, you put the Verb before the Subject.

Affirmative	You	are	happy.
	Subject	Verb
Question	Are	you	happy?
	Verb	Subject

Affirmative	Question
I am intelligent.	Am I intelligent?
You are a student.	Are you a student?
He is a pilot.	Is he a pilot?
She is from Spain.	Is she from Spain?
It is a big house.	Is it a big house?
We are ready.	Are we ready?
You are doctors.	Are you doctors?
They are rich.	Are they rich?

To Be - Short Answers

In spoken English, we usually give short answers in response to questions.
Are you a student? - Yes, I am (a student). The last part (a student) is not necessary. We use shorts answers to avoid repetition, when the meaning is clear.

Question	Short Answers**	Short Answers
Am I intelligent?	Yes, you are.	No, you aren't.
Are you a student?	Yes, I am.	No, I am not.
Is he a pilot?	Yes, he is.	No, he isn't.
Is she from Spain?	Yes, she is.	No, she isn't.
Is it a big house?	Yes, it is.	No, it isn't.
Are we ready?	Yes, we are.	No, we aren't.
Are you doctors?	Yes, we are.	No, we aren't.
Are they rich?	Yes, they are.	No, they aren't.

** With To Be, We don't use contractions in affirmative short answers unless there is additional information after it (in which case they are no longer considered short answers).