(+) Affirmative : I am a teacher , You are a student, He is my friend, She is his wife, It is  dog , We are students , They are engineers , (-) Negative: I am not a teacher , You are not a student, He is not my friend , She is not his wife, It is not a dog, We are not students , They are not engineers , (?) Interrogative : Am I a teacher?, Are you a student?, Is he my friend?, Is she his wife?, Is it a dog?, Are we students? , Are they engineers?,

Prepare 1 unit 1 - verb to be

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