English Present Simple Tense; Affirmative, Negative, Interrogative Affirmative Negative Interrogative I am a doctor. I am not a doctor. Am I a doctor? You are an engineer. You are not an engineer. Are you an engineer? He is at home. He is not at home. Is he at home? She is my sister. She is not my sister. Is she my sister? It is a dog. It is not a dog. Is it a dog? We are friends. We are not friends. Are we friends? They are farmer. They are not farmer. Are they farmer?