need,must用法及練習

1、need用法一.用作實義動詞1.needsth.這是need最常見的用法之一，其后的賓語可以是名詞，也可以是代詞。如：1) .Thesoupneedsalt.2) .Theydonneedafraidanymore.3) .Doesheneedanyhelp?2. needdoing與needtobedone通常物做主語，need后面可跟動名詞作賓語，這種情況下應注意兩點：.主動形式的動名詞doing具有被動的含義；.該動名詞可以改為其動詞不定式的被動形式而句子的意義不變。例如：4) .Thedoorneedspainting.=Thedoorneedstobepainted.5) .Your

2、carneedsrepairing.=Yourcarneedstoberepaired.3. needtodosth.作為實義動詞，need后面需要接帶to的動詞不定式，表示有義務或責任去做某事。如：6) .Whatdoweneedtotakefortheparty?7) .WillweneedtoshowourIDcard?8) .Ineedtotakegoodcareofmysister.二.用作情態(tài)動詞.沒有人稱和數的變化。不論主語是第幾人稱，不論主語是單數還是復數，情態(tài)都詞都無形式變化；.不能單獨充當謂語。情態(tài)動詞必須與一個實義動詞一起構成復合謂語，并且這個實意動詞要始終是動詞原形。.

3、變?yōu)榉穸ň鋾r只需在情態(tài)動詞之后加not。9) .Youneedn'tdoitagain.10) .Heneedn'tworryaboutit.變?yōu)橐蓡柧鋾r只需將情態(tài)動詞提到主語的前面。例如：11) .NeedItypethisletteragain?12) NeedIstayhereanylonger?No,youneedn't.Yes,youmust.三.用作名詞need作為名詞，含義為缺乏，需要”；其復數表示基本需要”。要掌握兩個詞組：in(great)needof(急需)與meettheneedso硒足的需要)。例如：13) .There'snoneedf

4、oryoutotryagain.14) .Thefactoryisingreatneedoffunds.need+have+done”表示本來需要做某事而沒有做。needn't+have+done”則表示本來不需要做某事而做了”。Ineedn'thaveboughtsomuchwineonlyfivepeoplecame.Heneedhavehurriedtothestation.Inthatcase,bewouldn'thavemissedthetrain.youneednothavesaidthatshould+have+done"意思是本來應該做某事，而

5、實際沒做。"shouldn't+have+done"表示本來不應該做某事，而實際做了。含有指責對方或自責的含意。1. Tom,youaretoolazy.Theworkshouldhavebeenfinishedyesterday.2. Look,Tomiscrying.Ishouldn'thavebeensoharshonhim.3. youshouldhavetoldmemust+have+done”表示對過去事情的肯定推測，譯成幺定做過某事”，該結構只用于肯定句1. Itmusthaverainedlastnight,forthegroundiswet

6、.2. Youmusthavebeenmadtospeaktotheservant.must的用法1.must表示必須"、應該”。例如：Wemustprotectourenvironment.Everyonemustobeytherule.2 .must的否定形式mustnot表示不應該“、禁止“、不準”。語氣比較強烈。例如：Youmustn'tspeaklikethat.Youmustn'tbelateforschool.3 .在回答must的問句時，肯定形式用must來回答，但否定形式用needn'或don'thaveto回答。而不用mustn&#

7、39;來回答。例如：MustIbehomebefore8o'clock?（前我必須回家嗎？）Yes,youmust.No,youneedn't./No,youdon'thaveto.（是，你必須。）（不，你不必。）4.must還可表示推測，意思是乙定"、必定"，一般只用于肯定句中。分三種情況：1 .）對于現(xiàn)在狀態(tài)的推測，我們用：must+v.（狀態(tài)動詞或系動詞），例如：Hemustbeathome.他準在家里。）Theremustbesomechildrenintheroom.（房間里準有些孩子。）2 .）對于現(xiàn)在動作的推測，我們用：must+be+

8、doing（行為動詞），例如：Theymustbecleaningtheirroom.他們準是在打掃房間。）HemustbewatchingTV.（他準是在看電視。）3 .）對于過去事實的推測，我們用：must+have+i去分詞,例如：Itmusthaverainedlastnight.（乍晚準是下雨了。）Ididn'thearthephon田Usthavebeenasleep.（我沒有聽到電話，我準是睡著了。）練習Choosetherightanswer.()1.Youanyhelp,doyou?A.don'tneedB.needn'tC.needD.doesn&#

9、39;tneed()2.-MustIstayattheofficethisafternoon?-No,you.A.don'tB.needn'tC.don'tneedD.can't()3.Tomgetupalittleearliertomorrow.A. needsB.needC.needtoD.needsto()4.Needthedoctorwithyoutonight?A.stayingB.stayC.staysD.tostay()5.Look!Yourshirtissodirty.ItA. need washing()6. The supply canA.

10、meet need ofC. meet the needs ofB. needtowashC.needswashingD.needwash'thedemand.B.meettheneedofD.meetneedsof().7.ThehospitalisA.ingreatneedofblood.B.ongreatneedofC.ingreatneedwithD.ongreatneedwith()8.Yourroomisfullofdust.It.A.needcleanB.needcleaningC.needtobecleanedD.needstobecleaned()9.Davidany

11、thingtodrink?A.Need,B.Needs,C.Does-needD.Do-need()10.Youtothemeetingtomorrowifyouhavesomethingimportanttodo.A.neednttocomeB.dontneedcomeC. dontneedcomingD.needntcome二.Fillintheblanksusinghaveto,havegotto,must,should,oughtto,hadbetter.1 .Younotgetdownuntilthebushasstopped.2 .TheybeencouragedtospeakEn

12、glishafterclass.3 .Youoftenwaitalongtimeforabus.4 .WegoandseeMarytomorrow,butIdontthinkwewill.5.Inotmissmytrain.6.Whentraveling,youtakecareofyourhealth.7.Insomepartsoftheworld,youboilthewaterbeforedrinkingit.1.1 fyouhaveastomachpain,youdrinkhotweaktea.9 .Younotswimimmediatelyafteraheavemeal.10 .Younotwakemeupwhenyoucomein.三Translate1 .他需要好好睡上一晚上。