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be动词语法一、动词be（am,is,are的用法：be动词包括“am”,“is”,“are”三种形式。1.第一人称单数(I配合am来用。句型解析析：Iam+…例句：IamSnoopy.Iamtenyearsold.Iamastudent.Iamaboy.2.第二人称(You配合are使用。句型解析：Youare+…例句：Youaremygoodfriend.Youareagoodteacher.Youarebeautiful3.第三人称单数(HeorSheorIt配合is使用。句型解析：She(He,Itis+……例句：Sheisagoodgirl.Sheissotall.Sheisshort.4.人称复数(we/you/they配合are使用。句型解析：We(You,Theyare+……例句WeareinClass5,Grade7.Theyaremyfriends.Youaregoodstudents.二、be动词缩写1.与not缩写：is和are可分别与not缩写为isn’t和aren’t，但am却不能与not缩写为amn’t。2.与主语缩写：am、is、are可与前面的主语连写；I’magirl.She’sateacher.但当am,isare位于句末时，均不能与主语缩写。如：Tellmewhereheis(不能用he’s)。告诉我他在哪儿。HeistallerthanIam(不能用I’m)。他比我高。A：AretheywatchingTV?他们在看电视吗？B：Yes,theyare.(不能用they’re)是的。三、be动词否定、疑问形式1.否定句只需要在be动词后加not,即:amnot,isnot=isn'tarenot=aren't2.一般疑问句只需要将be动词提前至句首.即:Is.......?Are........?四、be动词在一般过去时中的变化：1．am和is在一般过去时中变为was。（wasnot=wasn’t2．are在一般过去时中变为were。（werenot=weren’t3．带有was或were的句子，其否定、疑问的变化和am,is,are一样，即否定句在was或were后加not，一般疑问句把was或were调到句首。用法口诀：我(I用am,你(you用are，is跟着他(he，她(she，它(it。单数名词用is，复数名词全用are。变否定，更容易，be后not加上去。变疑问，往前提，句末问号莫丢弃。还有一条须注意，句首大写莫忘记。练习题一.用括号中适当的词填空。1.I________(am,are,is)fromAustralia.2.She_______(am,are,is)astudent.3.JaneandTom_________(am,is,are)myfriends.4.Myparents_______(am,is,are)verybusyeveryday.5._______(Are,Is,Do,Does)thereaChineseschoolinNewYork?6._______(Be,Are,Were,Was)theyexcitedwhenheheardthenews?7.There_____(be)someglassesonit.8.Ifhe_____(be)freetomorrow,hewillgowithus.二、用be动词的适当形式填空1.I______aboy.______youaboy?No,I_____not.2.Thegirl______Jack'ssister.3.Thedog_______tallandfat.4.Themanwithbigeyes_______ateacher.5._____yourbrotherintheclassroom?6.Where____yourmother?She______athome.7.How_______yourfather?8.MikeandLiuTao______atschool.9.Whosedress______this?10.Whosesocks_____they?11.That______myredskirt.12.Who______I?13.Thejeans______onthedesk.14.Here______ascarfforyou.15.Here_____somesweatersforyou.16.Theblackgloves____forSuYang.17.Thispairofgloves______forYangLing.18.Thetwocupsofmilk_____forme.19.Sometea______intheglass.20.Gaoshan'sshirt_______overthere.三、把下列句子改成否定句和一般疑问句。1.Thisisthereadingroom.否定句：_______________________________一般疑问句：____________________________2.She’sMissLynn.否定句：_______________________________一般疑问句：____________________________3.IaminGrade3.否定句：_______________________________一般疑问句：____________________________4.MissZhangisourEnglishteacher.否定句：_______________________________一般疑问句：____________________________5.Weareteachers.否定句：_______________________________一般疑问句：____________________________6.Thesearepears.否定句：_______________________________一般疑问句：____________________________7.Weareintheclassroom.否定句：_______________________________一般疑问句：___________________________8.TomisfromtheU.K.否定句_____________________________________一般疑问句：___________________________9.Pandasareverycute.否定句：_______________________________一般疑问句：___________________________10.It’srainy(多雨的)inAugust.否定句：_______________________________一般疑问句：___________________________