单元语法小专题(GrammarFocus)语法精讲一、祈使句祈使句常用来表示命令、指示、请求、要求或建议等。1．当主语是第二人称you时，you通常被省略。这种祈使句一般以动词原形开头。它的否定形式是在动词原形前加Don't。如：Bemorecarefulnexttime.下次仔细点。Cometoschoolearliernexttime.下次早点来学校。Don'tplaycomputergames.不要玩电脑游戏。在祈使句的句首或句尾加please，可以使祈使句的语气更委婉。注意：在句尾加please时，要在please前加逗号。如：Pleasespeakloudly.＝Speakloudly，please.请大声讲话。2．带有第一、第三人称主语的祈使句通常以let为引导词，一般用来提建议。如：Let'swatchthecartoonnow.现在我们看卡通片吧。Let's/Letme祈使句的否定形式是Let's/Letmenot…或Don'tlet's/letme…；“Let＋第三人称”的否定形式为Don'tlet＋第三人称…。如：Let'snotplaysoccerinthestreet.我们不要在街上踢足球。Don'tletherwatchsomuchTV.不要让她看这么多电视。二、可数名词与不可数名词普通名词分为可数名词和不可数名词。1．可数名词可以用具体的数词来修饰，也可以用“数词＋计量名词＋of＋可数名词的复数形式”来表示。如：threeapples三个苹果；twobagsofwatermelons两袋西瓜2．不可数名词没有复数形式，表示量时用“数词＋计量名词＋of＋不可数名词”结构。如：acupofmilk一杯牛奶3．可数名词的量可以用howmany提问；不可数名词的量可以用howmuch提问。4．some，any，alotof，lotsof等既可以修饰可数名词，又可以修饰不可数名词。语法精练Ⅰ.用括号内所给单词的适当形式填空。1．________(keep)quietinthelibrary.2．Don't________(swim)intheriver，please.3．Pleasedon't________(be)lateforschoolnexttime.4．Youshouldnoteattoomuch________(meat)．5．Theyvisitedtwobig________(factory)lastmonth.6．There________(be)somebreadonthetable.Youcanhavesome.7．Wouldyouliketobuysome________(salt),Mrs.Smith?8．Bothhisuncleandhisauntarefamous________(scientist)．9．Howmuch________(coffee)isthereinthecup?10．Howmany________(watermelon)didyoubuyyesterday?Ⅱ.按要求完成下列句子，每空一词。新课标第一网11．Youmustlistentotheteachercarefully.(改为祈使句)________________theteachercarefully，please.12．Youcan'tpourthewaterintothepot.(改为祈使句)________________thewaterintothepot.13．Ihavetwobrothers.(对画线部分提问)________________brothersdoyouhave?14．Thereisalittlehoneyinthefridge.(对画线部分提问)________________________isthereinthefridge?15．Thereisatomatointhebox.(用three代替a改写句子)There________three________inthebox.Ⅲ.根据汉语意思完成句子，每空一词。16．请看第二幅图。________________thesecondpicture，please.17．会议室里有几位工程师？________________________arethereinthemeetingroom?18．凯特，请不要打开搅拌机。Kate，please________________________theblender.19．我们一起做香蕉奶昔吧。________________bananamilkshaketogether.20．我想要一杯酸奶和两个汉堡包。新课标第一网Iwouldlike________________________________andtwo________．单元语法小专题(GrammarFocus)Ⅰ.1.Keep2.swim3.be4.meat5.factories6.is7.salt8.scientists9．coffee10.watermelonsⅡ.11.Listento12.Don'tpour13.Howmany14.Howmuchhoney15．are；tomatoesⅢ.16.Lookat17.Howmanyengineers18.don'tturnon19.Let'smake20.a/onecupofyogurt；hamburgers系列资料www.xkb1.com
