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一般现在时主语单三人称时的动词变化①在一般现在时中，当主语为第三人称单数时，动词要用“s”型i）在动词尾直接加s。如：play—plays，want—wants，work—works，know—knows，help—helps，ii）以字母s、x、ch、sh或o结尾的动词加-es；如：guess—guesses，fix—fixes，teach—teaches，wash--washes，go—goes，do—does，watch—watches，catch—catchesiii）以辅音字母＋y结尾的动词，先变y为i，再加-es。如：study—studies，carry—carries，fly—flies，family—families,cry--cries强调如何将主语是第三人称单数的肯定句变为否定和疑问句。注：1、除三单外,其他人称的特殊疑问句：特殊疑问词加do来提问。如：Whatdoyouhave?Wheredotheylive?(除三单外其他人称包括I,we,you,they,myfriends,hisparents,MikeandDavis,mydogs...)2、三单的特殊疑问句:特殊疑问词加does来提问。如：Whatdoeshe\she\it\have?Wheredoesyourbrother\dog\friendlive?回答用He\She\It\Myfriendlives...这时候回答要用动词的S形式。3、非三单的否定句，直接在动词前面加don’t.三单的否定句在动词前面加doesn’t,后面要用动词原形。即“三单的疑问句和否定句中，有了does，后面要用动词的S形式。4、非三单的一般疑问句用do放句首来引导，三单的一般疑问句用does放句来引导，后面用动词原形。一般疑问句就是以助动词（do，does）、Be动词（am，is，are）、情态动词（can,may,will,could,等）引导，用YES或NO来回答。1）Hismotherworksinafactory．Hismotherdoesn’tworkinafactory．(否定句)Doeshismotherworkinafactory？（一般疑问句）2）MrLiteachesusEnglish．MrLidoesn’tteachusEnglish．（否定句）DoesMrLiteachyouEnglish？（一般疑问句）用下列词的适当形式填空1.She____________(have)blueeyes.2.We__________(go)toschooleveryday3.Theboy______________(like)blue.4.We____________(have)twocats.5.She____________(write)tohermotheronceaweek.6.Sheoften_____________(watch)TVonSaturdays.7.PeterandMaryoften___________(play)badmintontogether.8..Mymother____________(have)manybrothers.9..______(do)she_______(like)playingtheviolin?Yes,she_______(do).10..She______(have)fourbrothers.She_________(like)themverymuch.11..Heoften___________(have)dinnerathome.12..We____________(notwatch)TVeveryday.13..Sandyusually___________(play)thepianoonSundays.14..Thecat_____________(notlike)eatingfisheverymuch.15..SuHaiandSuYang_________(have)eightlessonsthisterm.16..SheandI____________(help)eachother.17.LiLeioften_______(help)me_________(study)English.18.Couldyouplease__________(teach)meEnglish?19.He____________(read)Englisheveryday.20.Ican____________(draw)manybeautifulpictures.．翻译下列句子1.他每天说英语。____________________________(改为否定句)________________________________（一般疑问句）__________________________________________3.他有一些书。_________________________(否定句)______________________(一般疑问句)_____________________________________。