用法：
1、be+名詞：
The man is a science teacher.
這個男子是一位科學(xué)教師。
Bill Clinton was the president of the US.
比爾克林頓是美國總統(tǒng)。
2、be+形容詞或副詞：
This soup is very tasty.
這湯很美味。
Mary’s new dresses are colourful.
瑪麗的新衣服色彩鮮艷
3、be+動詞ing形式連用表持續(xù)：
We were walking down the street.
我們正走在街上。
My mother is watching TV in the room.
我媽媽正在房間里看電視。
4、be+介詞短語：
John and his wife are from Manchester.
約翰和他的妻子來自曼徹斯特。
The flowers are on the table.
花在桌子上。