英语学习先从简单点单词句子开始，同时语法也很重要！今天看看be动词用法及怎么把肯定句变否定句，如何把陈述句变疑问句！

口诀：

我用am，你用are，is连着他，她，它;

单数名词用is，复数名词全用are.

变疑问，往前提，句末问号莫丢弃

变否定，更容易，be后not莫忘记

疑问否定任你变，句首大写莫迟疑

be动词用法

“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).

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(TheComplement)。例如：

1.Themanisascienceteacher.

2.Mary'snewdressesarecolourful.

3.Ihavebeentherebefore.

4.Motherisinthekitchennow.

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：

He'snot../Heisn't.

You'renot../Youaren't

但“am+not”的缩写法只有一个：

I'mnot.

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：

Tony'smaidiswashinghisnewcar.

Thechildrenareplayinginthefield.

SamuelwaseatingwhenIcamein.

Wehavebeenlivingheresince1959.

2.“Be+过去分词”以组成被动语态(ThePassiveVoice),如：

Hermoneyinthedrawerwasstolen.

Anumberofgoodjobsaretakenupbyforeigners.

DavidstudiedinTaiwanbuthasbeentrainedasalanguagelecturerinAmerica.

CanallthewonderfulbirdsbefoundinourBirdPark?

Thedisobedientboywastoldtostandout-sidetheclassroom.

Stepsarebeingtakentoreducetrafficcon-gestionduringpeakhours.

Dishoneststudentswillbeimmediatelydealtwith.

拓展

一、肯定句变否定句：加not

'tworkhere.

'tbeeninChina.

'mnotastudent.

'tbeentoGuiling.

'tgoingtodoherhomework.

useto疑问句和否定句有两种方式：1像其它行为动词过去时一样,借助于助动词did,used恢复原形直接用used,提前构成疑问句,后面加not构成否定句

二、陈述句变疑问句

1·先找系动词be:am,is,are,was,were。找到后提前变人称(第一人称变第二人称，第三人称不变)加问号。例:youareapupil变Areyouapupil?

2找不到系动词再找情态动词:canmaymustwillshallneedcouldshouldwouldmight找到后变人称(第一人称变第二人称，第三人称不变)加问号。例:Theywillgotoschool.变Willtheygotoschool?

3找havegot,hasgot,hadgot.找到后把havehashad提前，got留在原地不动。变人称加问号例:YouhavegotaTV.变HaveyougotaTV?

4添加助动词:dodoesdid,把助动词加在最前面，例:Iplaywithadog变Doyouplaywithadog.以上四种方法变成疑问句之后把里面的动词都变成原型。

一般疑问句及肯定否定回答

1、问句：IsthisyourEnglishbook？

肯答：Yes，itis.

否答：No，itisn`t.

2、问句：AretheseyourEnglishbooks？

肯答：Yes，theyare.

否答：No，theyaren’t.

3、问句：CanyouspeakEnglish?

肯答：Yes，Ican.

否答：No，Ican’t.

4、问句：DoyourparentslikeEnglish？

肯答：Yes，theydo.

否答：No，theydon’t.

5、问句：CanyouspeakEnglish?

肯答：Certainly\Ofcourse.

否答：Sorry,Ican’t.

6、问句：MayIwatchTVaftersupper?

答：Yes,youmay./No,youmustn't.

7、问句：MayIstophere?

答：No,youmustn't.

8、问句：MustIfinishmyhomeworkbeforeeighto'clock?

答：Yes,youmus.

9、问句：MustIattthemeeting?

答：No,youneedn't(No,youdon'thaveto).YoucanaskTomtogoinstead.

10、问句：Needwestaybehindafterschool?

答：Yes,youmust.

11、问句：Needhegonow?

答：No,heneedn't.

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