be动词有:am/is/are/was/were,在句子中充当谓语动词的成分。在一般现在时中,当主语是第一人称的时候,谓语动词可以用am,当主语是第三人称he/she/it,又或者是名词单数的时候,谓语动词是is,当主语是they/we,又或者是名词复数时,后面的谓语动词可以是are。
★“Be”有两种缩写法,如下:
He's not...../He isn't....
You're not...../You aren't...
★但“am + not”的缩写法只有一个:
I'm not.
有人用“ain't”, 但这并不是标准英语。
谈过了“be”作主动词的功能
★当“be”要在祈使句中出现时,陈述句可借助助动词“do”,否定句必须在前加上助动词“don't”,如:
Don't be silly!
Do be obedient!
Be careful!
Don't be a fool!
【1.】“Be + 现在分词”以组成进行式时态(Continuous Tenses),如:
Tony's maid is washing his new car.
The children are playing in the field.
Samuel was eating when I came in.
We have been living here since 1959.
形式
有不同的be动词,基本上为:
am,is,are,was,were,been,being,be。
被动语态
被动语态的基本结构为be+done(Be动词+动词过去分词)
一般现在时:am/is/are+done
一般过去时:was/were+done
一般将来时:will+be+done
现在进行时:am/is/are+being+done
过去进行时:was/were+being+done
现在完成时:have/has+been+done
过去完成时:had+been+done
一般构句
代词/专有名词+be+普通名词(如我们是亲兄弟)
代词+be+专有名词(如我是爱丽丝)
代词/专有名词+be+物主代词+普通名词(如我是你的亲姐妹)