be动词的用法常见的be 动词形式：am is are口诀: 我(I)用am,你,你们(you)用are, is 跟着他( he ) ,她( she ) ,它( it )单数 is 例如：This is a pen. The boy is very lovely.复数are 例如：We are students. They are in the park. The girls are from England.be 动词的否定形式：am not, is not= isnt, are not= arent含有be动词的陈述句变为否定句：在be动词后面加not含有be动词的陈述句变为一般疑问句：将be动词提到句首。例如：He is a good boy. Is he a good boy?They are in the school. Are they in the school?This is a book. Is this a book?The man is a doctor.
