2016年卫生类职称英语词汇：be
2015-07-22 11:52 来源：医学教育网
2016年卫生类职称英语词汇：be
be动词的各种形态我们要认识：
1.be动词的现在时有三个：am, is, are
am的主语是I，组成I am/I'm
is的主语是单数第三人称，如：He is/She is/My mother is/Mary is
are的主语是复数，如They are/You and your brother are/Tom and Jerry are
2.be动词的过去式有2个：was, were
was的主语是I和第三人称单数，如I was/She was/It was
were的主语是复数，如You were/They were
3.be动词的过去分词为：been
如:I have been to...
4.be动词的原形就是be，一般放在将来时和其他要接动词原形的词后，如I will be there soon./ Try to be good,Jerry.
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