The Verb TO BE

+	-	-	-
I am a student	I am not a student		I'm not a student
You are in London	You are not in London	You aren't in London	You're not in London
He is my friend	He is not my friend	He isn't my friend	He's not my friend
She is happy	She is not happy	She isn't happy	She's not happy
It is a school	It is not a school	It isn't a school	It's not a school
We are doctors	We are not doctors	We aren't doctors	We're not doctors
You are from here	You are not from here	You aren't from here	You're not from here
They are in class	They are not in class	They aren't in class	They're not in class

?	+	-	-
Am I in the list?	Yes, you are	No, you aren't	No, you're not
Are you Ok?	Yes, I am		No, I'm not
Is he your brother?	Yes, he is	No, he isn't	No, he's not
Is she Mary?	Yes, she is	No, she isn't	No, she's not
Is it working well?	Yes, it is	No, it isn't	No, it's not
Are we invited?	Yes, we are	No, we aren't	No, we're not
Are you at home?	Yes, we are	No, we aren't	No, we're not
Are they in the cinema?	Yes, they are	No, they aren't	No, they're not