Unit6Electricity同步單元語法精講精練+語法專題訓練2022-2023學年七年級下冊牛津深圳版（解析版）單元語法：情態(tài)動詞can/may/must的用法（1）情態(tài)動詞的定義情態(tài)動詞是一類用于表示說話人的語氣和情態(tài)的助動詞。常表示命令、請求、拒絕、義務、可能、需要等。（2）情態(tài)動詞的特點1.情態(tài)動詞無人稱和數(shù)的變化,2.情態(tài)動詞后面跟的動詞需用原形,否定式構成是在情態(tài)動詞后面加"not"。3.個別情態(tài)動詞有過去式,過去式用來表達更客氣,委婉的語氣,時態(tài)性不強,可用于過去，現(xiàn)在。（3）情態(tài)動詞的用法can/may/mustcan的用法1.can可以表示能力，意為“能，會，”也可以表示許可或者請求對方允許，意為“可以”。cannot/can’t意為“不能，不會，不可以”,過去式為could.1)表示能力,意為“能、會”,例如：I___________________(會說）alittleEnglish.I__________________(不會游泳）.--Canyourideabike?--Yes,________________./No,__________________.2)表示請求或允許，多用于口語中，意為“可以、能”等You________________________（可以回家）now.You_______________________(不能停）yourcarhere.--CanIborrowyourbike?--Yes,__________________./No,________________.3)用于否定句、疑問句，感嘆句中，表示猜測、懷疑或不肯定.帶有感情色彩Lucy___________________(不可能是）athomenow,shewenttotheparkjustnow.It_________________true.它不可能是真的。She_________________morethanthirty。她不可能超過三十歲?！咀⒁猓骸?could是can的過去式,有兩種用法,一種表示過去式；一種用來表達更加客氣,委婉的語氣,時態(tài)性不強,可用于過去，現(xiàn)在。WhenIlivedathome,IcouldwatchTVwheneverIwantedto.Can[Could]Icomein?(could更加委婉)can和beableto的區(qū)別:beableto有人稱數(shù)和時態(tài)的變化。Beableto可以用于過去、現(xiàn)在、將來等多種時態(tài)。Tomwasabletoswimattheageof5.Icancometomorrow.=Iwillbeabletocometomorrow.may的用法may表示許可或者請求對方允許，意為“可以”maynot意為“不可以”過去式為might1)表示“請求，許可”，此時與can同義，可以互換使用Youmay/cangotothecinemathisevening.☆注意：表許可時其答語可以用“Yes,youmay.”但是由于用may做肯定回答語氣顯得生硬、嚴肅，因此一般用Yes,please./Certainly./Ofcourse.這些回答顯得熱情、客氣。拒絕對方時,答語可以用No,youmustn’t./No,youcan’t./Sorry,youcan’t./No,pleasedon’t等--MayIcomein?--Yes,please--MayIuseyourruler?--Certainly.Hereyouare.2)may/might表示不太肯定的猜測，意為“有可能”Lucymaycometoschoollatetoday.Hemaybeverybusynow.【注意】：might是may的過去式,有兩種用法,一種表示過去式，一種表示更加委婉,客氣的語氣或?qū)赡苄缘膽岩伞ust的用法3.must表示“規(guī)定，命令，強制”意為“必須，一定”mustnot/mustn’t意為“禁止，不準”1)must(“必須”,表示命令)，mustn’t(“一定不能”,表示強烈禁止...)You_________________________(必須去睡覺）before22:00pm.You__________________________(不允許玩）withfire.It’sdangerous!--MustIreturnitnow？Yes,__________.--No，________________【注意】：在回答must的疑問句中，否定回答用needn’t或don’thaveto表示“不必”，不用mustn’t2)must還可以表示非?？隙ǖ牟聹y，意為“一定”Thegirlinaredskirt_____________(一定是）Lucy.It___________（一定是）rose3)must/haveto的區(qū)別：①.must表示必須，強調(diào)主觀上的愿望；haveto表示“不得不”，強調(diào)客觀需要You__________________(must/haveto)gobebedbefore22:00pm.Mybikeisbroken,soI_________________(must/haveto)gotoschoolonfoot.②.haveto有人稱、數(shù)、時態(tài)的變化；must則沒有。I_______________(不得不）cleantheclassroomtoday.She_______________(不得不）finishherhomeworkfirst.Itwaslate,he_______________(不得不）gotoschoolwithoutbreakfast.4.情態(tài)動詞表示猜測肯定句：must(一定）>may（可能）>might>could（也許，或許）can/could一般用于否定句和疑問句否定句：can’t>couldn’t（不可能）>maynot>mightnot（可能不）沒有mustn’tbe的用法Unit6單元語法專題訓練1.Agoodfriendissomeoneyou________shareyourpleasureandpainwith.A.oughtB.needC.canD.must2.—Mum,______Iplayfootballthisafternoon?

—Sure,butyou

______finishyourhomeworkfirst.A.may;could

B.can;must

C.can;mustn't

D.may;can't3.—Excuseme,

isthistherightwaytotheChildren'sPalace?—Sorry,I'mnotsure.Butit________be.A.mustn'tB.might

C.can't

D.must4.—Youlookverypretty,

ifI

________sayso.—Thanksalotforsayingthat.A.mustB.may

C.will

D.

haveto5.

Pleasedon'tmakesomuchnoise.I________hearthespeakerverywell.A.needn't

B.mustn't

C.can't

D.shouldn't

6.You________takemetothestation.Mybrother'stakingme.A.can'tB.mustn't

C.shouldn'tD.don'thaveto7.—Mum,________IvisittheModernArtMuseumnextMonday?—I'mafraidyoucan't.AllthemuseumsinthiscityareclosedonMonday.A.would

B.need

C.should

D.may8.Weneedcleanairandwater,

sowe

________protecttheenvironment.A.can

B.may

C.must

D.might9.

—Whatshouldwedotoprotectthefishintheriver?—We________throwrubbishintotheriver.A.needB.needn't

C.must

D.mustn't10.—What'swrongwithJudy?Shehasbeenabsentfortwodays.—Oh,she_____beill.Let'sgotoaskMr.Green.A.mayB.needC.would11.—We'vegoteverythingreadyforthepicnic.—DoyoumeanI______bringanythingwithme?A.can'tB.mustn't

C.couldn't

D.needn't12.—Excuseme,________Itakethemagazineoutofthereadingroom?—Sorry,youcan't.Justhere,please.A.mustB.would

C.may

D.need13.Rockmusic___soundpopularwiththeyoung,

butit'snotthefavoroftheagedpeople.A.mustB.need

C.should

D.may14.—MustIwaithereallmorning?Ihavealotofworktodo.—No,you____.Youmaybebackintheafternoon.A.mustn'tB.can't

C.don'thaveto15.Thepassengers______showtheirIDcardsbeforegettingontheplane.A.mightB.must

C.could16.—Finally,

theycameback.—They_____behungryaftersuchalongwalk.A.can'tB.must

C.needn't17.

—Istillhaven'tfoundmypetdog.—I'msorrytohearthat.You_____beverysad.A.canB.should

C.must

D.will18.

—Lookattheyoungladyinred.IsitMrs.Li?—No.It________beher.Sheiswearingawhitedresstoday.A.mustn't

B.needn't

C.can't19.

—IsthatmanMr.Zhang?—It________behim.HewenttoBeijingforameetingyesterday.A.can'tB.mustn'tC.needn't20.

Thegirlintheclassroom________beSarah.Shehasgonetothelibrary.A.mayB.must

C.can't

D.needn't21.

—