Interrogative: Am I happy?, Are you Mario?, Is he from France?, Is it your cat?, Is she your sister?, Are we in your school?, Are you and Sandra best friends?, Are they your sisters?, Negative: I'm not happy, You are not Mario, He is not from France, It isn't your cat, She isn't your sister, We aren't in your school, You and Sandra are not best friends, They are not your sisters,

Verb TO BE: negative and interrogative forms

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