be动词的形式和用法

be动词的形式：

  be,is,am,are,was,were,being,been

  1、The man is back.

  2、They are back.

  3、He was back.

  4、They were back.

  5、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。

  1、The man is a teacher.

  2、Mary’s new dresses are colorful.

  3、My mother was in the kitchen.

练习

  1、他们是老师。

  They are teachers.

  2、他以前是一名老师。

  He was a teacher before.

  3、他已经当了3年的老师。

  He has been a teacher for 3 years.