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It is my birthday. (-)
It isn't my birthday.
The pen is black. (-)
The pen isn't black.
We are best friends. (-)
We aren't best friends.
... your cat hungry? Yes, it ....
Is, is
................. her mum and dad at home? No, they ................. .
Are / aren't
................. you bored? No, I ................. .
Are / am not
