be动词、助动词、情态动词讲解(基础篇)Microsoft_Word_文档VIP免费

be动词、助动词、情态动词讲解(基础篇)1、be动词的用法。beam/isare现在时waswere过去时单数复数英语中，be动词选用单数还是复数，要由主语来定，主语是单数，就用单数，反之用复数。◆句中含有be动词时：肯定句：主语＋be＋其他否定句：主语＋be＋not＋其他一般疑问句：Be＋主语＋其他＋？特殊疑问句：疑问词（what/who/when/where）＋be＋主语＋其他＋？Iamateacher.Youareright.Sheis16yearsold.Myfatherisathome.Thestudentsareplayinggames.Myteacherwasillyesterday.Thereisapictureonthewall.Therearetwobooksonthetable.★be动词用法歌：我用am，你用are，is连接他她它。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动词作谓语，它后面一般跟名词、形容词或介词短语。她个子很高。她在教室里。她是一个高个子的女孩。2、助动词的用法。英语句子按正常语序是“什么人或事物”+“做什么”，即，我们常说的“主语+谓语+其他”。①主语为I或复数名词、代词时：肯定句：I/We/They/Thestudents＋动词原形＋其他＋。WewatchTVeverynight.变否定：主语＋don’t＋动词原形＋其他＋。Wedon’twatchTVeverynight.一般疑问句Do+主语+动词原形+其他+？DoyouwatchTVeverynight?Yes,wedo./No,wedon’t.特殊疑问句：疑问词+do+主语+动词原形+其他+？HowoftendoyouwatchTV?②主语为单数名词或代词时：肯定句：主语+动词第三人称单数形式+其他+。1达闻中小学生课外辅导中心学员辅导资料HewatchesTVeverynight.否定句：主语+doesn’t+动词原形+其他+。Hedoesn’twatchTVeverynight.一般疑问句：Does+主语+动词原形+其他+？DoeshewatchTVeverynight?Yes,hedoes./No,hedoesn’t.特殊疑问句：疑问词+does+主语+动词原形+其他+？HowoftendoeshewatchTV?★主语为单数或不可数名词，谓语要用单数第三人称，反过来，看见动词用了单数第三人称，可以推知主语是单数或不可数名词。()1.How_________yourdadhelpathome?A.doB.doesC.is()2._______goesbadeasilyinsummer.A.MilkB.ApplesC.Cakes③过去时的句式（当句子时态为过去时时，动词用过去式，不受主语单复数的影响）肯定句：主语+过去式+其他+。He/Wegotupearlyeverymorninglastyear.否定句：主语+didn’t+动词原形+其他+。He/Wedidn’tgetupearlyeverymorninglastyear.一般疑问句：Did+主语+动词原形+其他+？Didhe/yougetupearlyeverymorninglastyear?Yes,he/wedid./No,he/wedidn’t.特殊疑问句：疑问词+did+主语+动词原形+其他+?Whendidhe/yougetupeverymorninglastyear?★小学阶段，助动词一般只出现在否定句或疑问句中，助动词用在肯定句中表示强调。3、情态动词的用法。情态动词表示说话人的语气或情态。初中英语中，常见的情态动词有：can(could),may(might),should,must,will(would),oughtto,haveto,need等。★情态动词的共同点：不受主语单复数的影响；情态动词后用动词原形。情态动词和动词原形共同构成谓语部分。肯定句：主语+情态动词+动词原形+其他+。She/Theycanswimwell.否定句：主语+情态动词+not+动词原形+其他+。She/Theycannotswimwell.一般疑问句：情态动词+主语+动词原形+其他+？2达闻中小学生课外辅导中心学员辅导资料Canshe/theyswimwell?Yes,she/theycan./No,she/theycan’t.特殊疑问句：疑问词+情态动词+主语+动词原形+其他+?Whycanshe/theyswimwell?Whocanswimwell?练习ⅰ.am,is,are专项练习。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______forJim.18.Physics_______myfavoritesubject.19.Thepolice_____runningafterthethief.20.Ourclass________goingtothezoo.3ⅱ.将下列句子奇数变成否定句，偶数变疑问句。1.Ilikemusic.2.Hewalkstoschool.3.TheyoftenhaveEnglishonMonday.4.Theboysareswimmingintheriver.5.Shesmileshappily.6.Marywenttothezoolastweek.7.Theworkersmademanycarsinthefactory.8.Weshouldprotecttheinnocent.9.HerparentsflytoLondontwiceamonth.10.AllmyclassmatesclimbedtheTaiMountlastautumn.11.Theteacherasksustocleantheclassroom.12.HewillgobacktoAmericaattheendoftheyear.ⅲ.将下列句子先变成否定句，一般疑问句，再对划线部分提问。1)CandyandSamarecleaningtheirroom.2)Plantsgrowfastinspring.3)Mybrotherboughtsomeflowersformymother.4)Wewritetoeachothertwiceamonth.