be动词的用法：be(be/is/are/am/was/were)vi
现在时Iam,youare,heis,weare,youare,theyare(缩略式I'm,you're,he's,
we're,you're,they're),(否定缩略式I'mnot,isn't,aren't),过去时Iwas,youwere,he
was,wewere,youwere,theywere(过去时否定缩略式wasn't,weren't),过去分词been,
现在分词being
英语的“be”是个特殊动词;有些语言，如马来文等，并没有“be”这样的动词。
“Be”除了原形的“be”之外，还有另外七种形式：am,is,are,been,being,was,were.
在句子中，“be”可以是主动词(ThePrincipalVerb)或助动词(TheAuxiliaryVerb)
例句对照
【当主动词时，“be”在性质上属于接系动词(TheLinkingVerb),后面要有名词、形容词、地方副词或短语作补足语(The
Complement)。例如：
1.Themanisascienceteacher.
这个男子是一位科学教师
2.Mary'snewdressesarecolourful.
玛丽的新衣服色彩鲜艳
3.Ihavebeentherebefore.
我以前去过那里
4.MymotheriswatchingTVintheroom.
母亲现在在客厅看电视
【这四个都是陈述句，可以变成疑问句，方法简单，把主语和“be”或助动词对换位置即可：
5.Isthemanascienceteacher?
6.AreMary'snewdressescolourful?
7.HaveIbeentherebefore?
8.Ismotherinthekitchennow?
【当“be”要在祈使句中出现时，它必须借重助动词“do”或“don't”之助，如：
9.Don'tbesilly!
10.Dobeobedient!
11.Don'tbeafool!
【“Be”有两种缩写法，如下：
12.He'snot...../Heisn't....
13.You'renot...../Youaren't...
【但“am+not”的缩写法只有一个：
14.I'mnot.
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，现在看看“be”作助动词时，有些什么用法：
【1.】“Be+现在分词”以组成进行式时态(ContinuousTenses)，如：
15.Tony'smaidiswashinghisnewcar.
16.Thechildrenareplayinginthefield.
17.SamuelwaseatingwhenIcamein.
18.Wehavebeenlivingheresince1959.
【2.】“情态动词+Be+过去分词”以组成被动语态(ThePassiveVoice),如：
19.Hermoneyinthedrawerwasstolen.
20.Anumberofgoodjobsaretakenupbyforeigners.
21.DavidstudiedinTaiwanbuthasbeentrainedasalanguagelecturerin
America.
22.CanallthewonderfulbirdsbefoundinourBirdPark?
23.Thedisobedientboywastoldtostandout-sidetheclassroom.
24.Stepsarebeingtakentoreducetrafficcon-gestionduringpeak
hours.
25.Dishoneststudentswillbeimmediatelydealtwith.
