Verb to be (affirmative, negative, interrogative)

To be - Positive Sentences & Contractions Full forms of the verb to be I am a student. He is a teacher. She is a journalist. It is a book. We are mechanics. You are pilots. They are policemen. Contracted forms of the verb to be I ´m a student. He ´s a teacher. She ´s a journalist. It ´s a book. We ´re mechanics. You ´re pilots. They ´re policemen.

To be - negative forms and contractions

Full negative forms of the verb to be

I am not a singer. He is not a receptionist. She is not a nurse. It is not my book. We are not not musicians. You are not a shop assistant. They are not taxi drivers. Contracted negative forms of the verb to be I'm not a singer. He isn't a receptionist. She isn't a nurse. It isn't my book. We aren't not musicians. You aren't a shop assistant. They aren't taxi drivers.

The verb to be - yes / no questions

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Am I right? Is he here? Is she a nurse? Is it second-hand? Are we wrong? Are you Alan Parker? Are they American?

On this link you will find more exercises to practice each of these aspects: (you can check your answers by yourself)

http://www.eclecticenglish.com/grammar/PresentSimpleToBe1A.html