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be的使用英语中的be怎么使用,为什么有的地方用be、being却不能用am,is,are,

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be的使用
英语中的be怎么使用,为什么有的地方用be、being却不能用am,is,are,
e:[ bi:]
prep.是,有,在
例句与用法:
1.He has been there at least twice.
他至少去过那儿两次.
2.The concert will be in the school hall.
音乐会将在学校的礼堂内举行.
3.She has been in her room for hours.
她在自己的房间里待了几个小时.
名词be:
1.a light strong brittle grey toxic bivalent metallic element
同义词:beryllium,glucinium,atomic number 4
动词be:
1.have the quality of being; (copula,used with an adjective or a predicate noun)
2.be identical to; be someone or something
3.occupy a certain position or area; be somewhere
4.have an existence,be extant
同义词:exist
5.happen,occur,take place
6.be identical or equivalent to
同义词:equal
7.form or compose
同义词:constitute,represent,make up,comprise
8.work in a specific place,with a specific subject,or in a specific function
同义词:follow
9.represent,as of a character on stage
同义词:embody,personify
10.spend or use time
11.have life,be alive
同义词:live
12.to remain unmolested,undisturbed,or uninterrupted -- used only in infinitive form
13.be priced at
同义词:cost