be动词的形式 be, is, am, are, was, were, being, been ex: the man is back. The man was back. He was back. They have been back.Be 动词的用法 后面接名词，形容词地点副词或短语，作为补足语 The man is a teacher . Mary’s new dress are colorful.Be 动词的否定 The man is not back. I am not back.Be 动词的提问和回答 Ex: Is he a teacher? Yes he is/no he isn’t Are you a teacher? Yes I am /no I am not Were they in the classroomyesterday? 回答同上
