人教新课标必修三情态动词.ppt

GrammarFirstwealthishealth.
Q1:Whatshould/shouldn’twedotokeephealthy?
Q2:Whatkindoffoodmustweeattobestrong?
Q3:Whatoughtwetoeattostayslim?主要情态动词1.情态动词有一定的意义，只表示期待或估计某事的发生，不能表示正在发生或已经发生的事情。
2.没有人称和数的变化，即情态动词第三人称单数不加-s。
3.不能独立使用，它和后面的动词构成谓语。
4.情态动词除ought和have外，后面只能接动词原形
5.情态动词没有非谓语形式，即没有不定式，分词等形式。情态动词注意：
1)must表示推测时，只能用于肯定句。---Needhestartfromthebeginning?---Yes,hemust.---No,heneedn’t/doesn’thaveto.4)注意对need问句的回答:
--NeedIfinishtheworktoday?
--Yes,________________.
No,________________.
No,________________.情态动词4.can/couldhavedone“本可以，本可能做某事”用于肯定句中，表示对过去发生的事情做出的判断。情态动词注意：
might/mayhavedone,表示对过去发生的动作进行可能性推测，1.---MayIuseyourpencil?
---Yes,youmay./No,youmustn’t.情态动词情态动词YoushalldoasIsay.(命令)Youngpeopleshouldlearnhowtousecomputers.1.作为情态动词用，常用在否定句和疑问句中。2.作实义动词用，常用在肯定句中,有人称、时态、和数的变化
表示推测——情态动词的重要用法I.Trytoexplainthemeaningsofthemodalverbsinthefollowingsentences.
1.HecanspeakEnglishwell.
2.Youcangohomenow.
3.Thatcan’tbetrue.
4.CouldyoupleaseshowmethewaytoBeihaiPark?
5.Theyhuntersarelost.Theycouldstarve.
6.MayIcomein?
7.Hemaygiveyousomehelp.8.Don’tworry.Iwillhelpyou.
9.Oftenhewoulddressuplikearichman.
10.Wouldyouliketojoinusfordinner?
YoushallhavetheticketassoonasIgetit.
Youshouldarriveattheairporttwohoursbeforehegoes.
Itisfiveo’clock.Heshouldturnupsoon.
WangFengwinsanawardeveryyear.Hemustbestrong.

2.用情态动词完成句子
1).You’vebeenworkingallday.You______beverytired.
2).(Thedoorbellrings)Iwonderwhothatis.It______beLisa.She’sstillinthelibraryatthistime.
3).Itisalongtimesincewemetlasttime.You______comeandseeusmoreoften.
4.Ihaven’tdecidedwhereI’mgoingformyholidays.I_____gotoAustralia.
5.Myfather’sbirthdayiscoming.What_____Igivehim?
6.Whydon’tyoutryonthisdress?It_____lookniceonyou.
7.“Whowasthemantalkingwithyourteacher?”“I’mnotsure.It______beherbrother.”

8.Idon’tknowwhentheguests_____be
here.They______arriveatanytime.3.完成下列句子：
1.Idon‘tknowwheresheis,she_______________.
(可能在武汉）(be)
2.Atthismoment,ourteacher_______________
（想必在批改）ourexampapers.(mark/grade)
3.Theroadiswet.It________________(一定