語(yǔ)法專項(xiàng)突破系列9

語(yǔ)法專項(xiàng)突破系列9.情態(tài)動(dòng)詞和虛擬語(yǔ)氣一、情態(tài)動(dòng)詞考點(diǎn)19大情態(tài)動(dòng)詞的基本用法1.can/could(1)表示能力(could常用于過(guò)去的能力)*Thepolicestillhaven’tfoundthemissingchild,butthey’redoingalltheycan.

(2)表示理論上的可能性,“有時(shí)候可能會(huì)”(用在肯定句中)*Itcanbequitewindythere,especiallyinspring.(3)表示請(qǐng)求和允許,口語(yǔ)中常用could代替can(could用來(lái)表示現(xiàn)在,用以委婉地提出請(qǐng)求等,但回答時(shí)必須用can)*CouldyoutellmehowIcangettotherailwaystation?(4)表示推測(cè)“可能”(用于否定句、疑問(wèn)句中)*Justbepatient.Youcan’texpecttheworldtochangesosoon.2.may/might(1)表示請(qǐng)求、允許、許可,might比may的語(yǔ)氣更委婉*—MayItakethebookout?—I’mafraidnot.(2)表示推測(cè)“可能”,可能性比can/could小*—Idon’treallylikeJames.Whydidyouinvitehim?—Don’tworry.Hemightnotcome.Hesaidhewasn’tcertainwhathisplanswere.3.must(1)表示“必須;應(yīng)該”*—ShallIinformhimofthechangeoftheschedulerightnow?*—Iamafraidyoumust,incasehecomeslateforthemeeting.(2)表示“偏要,硬要”做某事*Ifyoumustgo,atleastwaituntilthestormisover.(3)表示推測(cè),“一定”*—Goodmorning.I’vegotanappointmentwithMissSmithinthePersonnelDepartment.*—Ah,goodmorning.YoumustbeMrsPeter.4.shall(1)用于第一、三人稱的疑問(wèn)句中,表示征求對(duì)方的意見(jiàn)*Shallwegotothetheatrebybus?(2)用于第二、三人稱的陳述句,表示說(shuō)話人給對(duì)方的命令、警告、允諾或威脅;此外,表示法律、條文中規(guī)定必須……時(shí)也用shall*—Willyoureadmeastory,Mummy?*—OK.Youshallhaveoneifyougotobedassoonaspossible.5.should(1)表示勸告和建議,作“應(yīng)該”講*Youshouldlearnfromeachother.(2)表示驚訝、意外等情緒,意為“竟然”*Itissurprisingthatyoushouldnotknowit!(3)用在if條件句中,表示可能性很小,但也不是完全不可能*Ifyoushouldfailtocome,askMrSmithtoworkinyourplace.6.will/would(1)用于表示意志或意愿*—Whydidn’tyoucometoSimon’spartylastnight?—Iwantedto,butmymomsimplywouldnotletmeoutsolateatnight.(2)表示“請(qǐng)求;建議”。用would比will委婉、客氣些*Will/Wouldyoupleasekeepthedooropen?(3)表示習(xí)慣,will可以表示現(xiàn)在的習(xí)慣,意為“總是;習(xí)慣于”。表示過(guò)去的習(xí)慣性動(dòng)作用would*Hewouldgetupearlywhenhelivedinthecountry.(4)表示事物的某種性質(zhì)和傾向,或按規(guī)律“注定會(huì)”*Oilwillfloatonwater.7.need表示“需要;必要”,用于否定句、疑問(wèn)句和條件從句中*Ineedn’tworryaboutmyweekend—Ialwayshavemyplansreadybeforeitcomes.8.dare表示“敢;敢于”,主要用于疑問(wèn)句、否定句和條件從句中,一般不用于肯定句。Idaresay是習(xí)慣說(shuō)法,意為“我想,大概”*Idaren’tcatchthemouse.9.oughtto表示義務(wù),意為“應(yīng)當(dāng)”,語(yǔ)氣比should強(qiáng),表示不十分肯定或含蓄的推測(cè),意為“應(yīng)是,應(yīng)該”*Yououghttoworkharderthanbefore.【點(diǎn)津】3組易混詞(組)用法比較另外要注意:(1)can的一些常用固定搭配cannotbutdosth./cannothelpbutdosth./cannotchoosebutdosth.表示“不得不,只好”cannot/cannever...enough/too再……也不為過(guò)(2)may的一些常用固定搭配maywell+動(dòng)詞原形意為“理應(yīng),有足夠的理由”,may(might)aswell+動(dòng)詞原形意為“還不如,不妨”。(3)mustn’t表示“禁止”“不許做某事”回答用need提問(wèn)的問(wèn)句時(shí)與回答用must提問(wèn)的問(wèn)句時(shí)一樣,肯定回答用must,否定回答要用needn’t或don’thaveto。【典例剖析】單句改錯(cuò)(2015·全國(guó)卷Ⅰ)Wemustfoundways.解題關(guān)鍵:情態(tài)動(dòng)詞must后使用動(dòng)詞原形。答案判定:found改為find【高考集訓(xùn)】單句改錯(cuò)/填空1.(2014·全國(guó)卷Ⅱ)Wecanlieonthegrassforarest,orsatbythelakelisteningtomusic.(改錯(cuò))

()sat改為sit2.(2014·全國(guó)卷Ⅰ)Youmay____(find)thatyourchildisattractedbyonemorethananother.3.(2015·全國(guó)卷Ⅰ)Butyou_____besuccessfulwhenthere’salackoftrustinarelationship.findcan’t考點(diǎn)25大表示推測(cè)的情態(tài)動(dòng)詞用法比較情態(tài)動(dòng)詞適用句式適用時(shí)態(tài)意義must肯定句一般時(shí)、進(jìn)行時(shí)、完成時(shí)一定、肯定Jackdescribedhisfather,whomusthavebeenabraveboymanyyearsago,asastrong-willedman.情態(tài)動(dòng)詞適用句式適用時(shí)態(tài)意義can(could)疑問(wèn)句,否定句一般時(shí)、進(jìn)行時(shí)、完成時(shí)可能,能夠Itcan’tbethepostmanatthedoor.It’sonlysixo’clock.情態(tài)動(dòng)詞適用句式適用時(shí)態(tài)意義may(might)肯定句,否定句一般時(shí)、進(jìn)行時(shí)、完成時(shí)也許,可能—Ileftmyhandbagonthetrain,butluckilysomeonegaveittoarailwayofficial.—Howunbelievabletogetitback!Imean,someonemighthavestolenit.情態(tài)動(dòng)詞適用句式適用時(shí)態(tài)意義should(oughtto)肯定句,否定句一般時(shí)、完成時(shí)確定或期待,“應(yīng)該”Ishouldn’thavewatchedthatmovie—it’llgivemehorribledreams.will(would)肯定句、否定句、疑問(wèn)句一般時(shí)、進(jìn)行時(shí)、完成時(shí)大概*Thiswillbethehouseyou’relookingfor.這大概就是你正在找的那所房子了。二、虛擬語(yǔ)氣考點(diǎn)1狀語(yǔ)從句中虛擬語(yǔ)氣的用法1.非真實(shí)條件句中虛擬語(yǔ)氣的用法if條件從句從句的謂語(yǔ)形式主句的謂語(yǔ)形式表示現(xiàn)在情況動(dòng)詞過(guò)去式(be的過(guò)去式用were)should/would/could/might+動(dòng)詞原形IfIhadtime,Iwouldgothere.if條件從句從句的謂語(yǔ)形式主句的謂語(yǔ)形式表示過(guò)去情況had+過(guò)去分詞should/would/could/might+have+過(guò)去分詞Ifyouhadcomeearlier,youcouldn’t/wouldn’thavemissedthebus.if條件從句從句的謂語(yǔ)形式主句的謂語(yǔ)形式表示將來(lái)情況should+動(dòng)詞原形should/would/could/might+動(dòng)詞原形動(dòng)詞過(guò)去式wereto+動(dòng)詞原形Ifitshouldrain/rained/weretoraintomorrow,thesportsmeetingwouldbeputoff.2.目的狀語(yǔ)從句中虛擬語(yǔ)氣的用法forfearthat/incase+從句:從句謂語(yǔ)用should+動(dòng)詞原形,意為“以防,萬(wàn)一”。*Wegotupearlyforfearthatweshouldmisstheearlybus.3.方式狀語(yǔ)從句中虛擬語(yǔ)氣的用法asif/asthough+從句:(1)與現(xiàn)在事實(shí)相反,從句用一般過(guò)去時(shí);(2)與過(guò)去事實(shí)相反,從句用過(guò)去完成時(shí);(3)與將來(lái)事實(shí)相反,從句謂語(yǔ)用would/could/might+動(dòng)詞原形。*ShespeaksEnglishasif/asthoughshewereanativeofNewYork.【點(diǎn)津】(1)asif/asthough連接的從句表示很有可能的事實(shí)時(shí),不需用虛擬語(yǔ)氣。(2)要特別注意一些特殊結(jié)構(gòu)的虛擬語(yǔ)氣。①在條件句中的省略如果虛擬條件句中含有were,should,had三個(gè)詞,可將if省略,把這三個(gè)詞前置于主語(yǔ)之前,形成部分倒裝。*WereIinyourposition,Iwoulddothesame.

②錯(cuò)綜時(shí)間虛擬句當(dāng)條件狀語(yǔ)從句所表示的行為和主句表示的行為所發(fā)生的時(shí)間不一致時(shí),這種虛擬條件句稱為錯(cuò)綜時(shí)間虛擬句。動(dòng)詞的形式要根據(jù)它所表示的時(shí)間做出相應(yīng)的調(diào)整。*Ifyouhadtakenthedoctor’sadvice,youwouldbebetternow.③含蓄虛擬條件句有時(shí)假設(shè)的情況并不以條件句表示出來(lái),而是暗含在上下文中,如通過(guò)介詞(短語(yǔ))with,without,butfor等來(lái)表示。*WewouldhaveputJohn’snameontheracelistyesterdaybutforhisrecentinjury.考點(diǎn)2其他從句中虛擬語(yǔ)氣的用法1.主語(yǔ)從句中的虛擬語(yǔ)氣Itisdesired/suggested/proposed/necessary/important/strange/natural/essential/apity+that從句,從句中的謂語(yǔ)動(dòng)詞用“(should+)動(dòng)詞原形”。*It’sstrangethatshe(should)makesomuchtrouble.

2.賓語(yǔ)從句中的虛擬語(yǔ)氣(1)表示“建議,命令,要求”等意義時(shí),賓語(yǔ)從句用“(should+)動(dòng)詞原形”。①堅(jiān)持:動(dòng)詞insist;②命令:order,command;③建議:動(dòng)詞advise,suggest,propose,recommend;④要求:動(dòng)詞request,require,demand,ask。*Teachersrecommendparentsnotallowtheirchildrenunder12toridebicyclestoschoolforsafety.【點(diǎn)津】①suggest意為“表明,暗示”時(shí),賓語(yǔ)從句不用虛擬語(yǔ)氣;②insist意為“堅(jiān)持說(shuō)”時(shí),賓語(yǔ)從句不用虛擬語(yǔ)氣。(2)Iwish(that)+賓語(yǔ)從句(虛擬語(yǔ)氣)。①表示愿望與“現(xiàn)在事實(shí)相反”,從句用一般過(guò)去時(shí);*Howhewishesthathewereabird!

②表示愿望與“過(guò)去事實(shí)相反”,從句用過(guò)去完成時(shí);*WewishthatwehadvisitedtheGreatWalllastyear.③表示將來(lái)愿望實(shí)現(xiàn)的可能性很小,從句常用could/would+動(dòng)詞原形。*Wewishwewouldliveonthemoononeday.(3)wouldrather/prefer+that從句(從句用虛擬語(yǔ)氣)①表示愿望與“現(xiàn)在事實(shí)或?qū)?lái)事實(shí)相反”,從句用一般過(guò)去時(shí)。*Iwouldratheryouwerenotherewithmenow.②表示愿望與“過(guò)去事實(shí)相反”,從句用過(guò)去完成時(shí)。*Iwouldratheryouhadn’tdonethat.3.表語(yǔ)從句和同位語(yǔ)從句中的虛擬語(yǔ)氣(1)在suggestion,proposal,order,plan,idea,request,advice等名詞后的表語(yǔ)從句和同位語(yǔ)從句中要用虛擬語(yǔ)氣。其構(gòu)成是“(should+)動(dòng)詞原形”。*Hegaveordersthattheguests(should)behospitablyentertained.(2)asif,asthough引導(dǎo)的表語(yǔ)從句常用虛擬語(yǔ)氣,與現(xiàn)在事實(shí)相反用一般過(guò)去時(shí);與過(guò)去事實(shí)相反用過(guò)去完成時(shí)。*Itlooksasifhewere10yearsyoungertoday.*Itlooksasifhehadn’thadamealforaweek.4.定語(yǔ)