Be动词的形式
be
is am are
was were
being
been
The man is back.
They are back.
He was back.
They were back.
They have been back.
Be动词的用法
后面接名词、形容词、地点副词或短语作补足语
The man is teacher.
Mary's new dresses are colorful.
My mother was in the kitchen.
Be动词的练习
They are teachers
他们是老师
He was a teacher before.
他以前是一名老师。
He has been a teacher for 3 years.
他已经当了3年的老师。
Be动词的否定
am not
isn't
aren't
wasn't
weren't
The man isn't back.
I am not back.
They aren't back.
He wasn't back.
They weren't back.
Be动词的提问和回答
Is he a teacher?
Yes he is. / No, he isn't.
Are you a teacher?
Yes i am. / No, I am not.
Were they teachers?
Yes they were. / No, they weren't.
他是医生吗？
Is he a doctor?
No, he isn't.
他们昨天在教室吗？
Were they in the classroom yesterday?
Yes they were.
Nothing is impossible to a willing heart!