Просклоняйте глагол to be во временах Present, Past and Future Simple.

Present Simple: I am, he is, she is, it is, we are, you are, they are. Past Simple: I was, he was, she was, it was, we were, you were, they were. Future Simple: I will be, he will be, she will be, it will be, we will be, you will be, they will be. Если нужно образовать вопрос, то в любом времени форма глагола to be ставится перед подлежащим (Is he ... ?; Was she ... ?; Will you be ... ?). Если нужно образовать отрицание, частица not ставится после глагола (am not, was not, will not be).