1、be+名词：
The man is a science teacher.
这个男子是一位科学教师
Bill Clinton was the president of the US.
比尔•克林顿是美国总统。
2、be+形容词或副词：
This soup is very tasty.
这汤很美味。
Mary’s new dresses are colourful.
玛丽的新衣服色彩鲜艳
3、be+动词ing形式连用表持续：
We were walking down the street.
我们正走在街上。
My mother is watching TV in the room.
我妈妈正在房间里看电视。
4、be+介词短语：
John and his wife are from Manchester.
约翰和他的妻子来自曼彻斯特。
The flowers are on the table.
花在桌子上。
be动词作为一种助动词，与过去分词一起搭配使用有两种句法结构。
1、“be动词+过去分词”构成被动语态。
如：The meeting was postphoned.会议延期了
2、“be动词+过去分词”构成系表结构。
如: The window was broken. 窗户坏了。
be 动词变形有：is，am，are，was，were，being，been，to be
可接：
名词 例：student They are students.
短语 例：in the kitchen she is in the kitchen.
形容词 例：beautiful You are beautiful.
地方副词 例：there I have been there.
进行时态 be doing
例：The children are playing in the field.
被动语态 be done
例：Her money in the drawer was stolen
O(∩_∩)O~~~
be 动词变形有：is，am，are，was，were，being，been，to be
可接：
名词 例：student They are students.
短语 例：in the kitchen she is in the kitchen.
形容词 例：beautiful You are beautiful.
地方副词 例：there I have been there.
进行时态 be doing
例：The children are playing in the field.
被动语态 be done
例：Her money in the drawer was stolen
1、be+名词：
The man is a science teacher.
这个男子是一位科学教师
Bill Clinton was the president of the US.
比尔•克林顿是美国总统。
2、be+形容词或副词：
This soup is very tasty.
这汤很美味。
Mary’s new dresses are colourful.
玛丽的新衣服色彩鲜艳
3、be+动词ing形式连用表持续：
We were walking down the street.
我们正走在街上。
My mother is watching TV in the room.
我妈妈正在房间里看电视。
4、be+介词短语：
John and his wife are from Manchester.
约翰和他的妻子来自曼彻斯特。
The flowers are on the table.
花在桌子上。
第一，做连系动词：主语+be+表语，表语可以是名词，代词，形容词，介词词组，动词不定式，例如：I am a teacher。第二，做助动词：be+动词现在分词，可构成进行时态。第三，做助动词 be+动词过去分词，可用于被动语态
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