高中二年級(jí)下學(xué)期英語(yǔ)《選擇性必修三 Unit 2 Healthy Lifestyle Discover Useful Structure》教學(xué)課件

Book3Unit2

HEALTHYLIFESTYLEDiscoverUsefulStructureAfterthisclass,youwilllearninfinitivesusedassubjectsuseinfinitivestocompletetheexercisesLearningObjectives1Lead-inLead-inTask1Readthefollowingsentencesandanalyzewhatpartdoestheunderlinedpartserveasineachsentence?1.Tochangebadhabitsisnevereasy.2.Ittookthesurgeonthreehours

tofinishmymother’slungsurgery.3.TojointhePeople’sLiberationArmy,itisrequiredformentoshaveofftheirbeards.

4.Itwasnotpolitetodisturbyourneighbourswithloudmusiclastnight.主語(yǔ)Lead-inLeadinTask2Comparethefollowingsentencesandfindthedifferencesofthesubjects.1.Tochangebadhabitsisnevereasy,evenwithmanyattempts.2.Topreventharmfulhabitslikethesefromdominatingateenager’slifeisessential.3.Afterall,itisnoteasytobreakbadhabits.4.However,duringthisperiod,itcanbeeasyforsomeofthemtoformbadhabits.5.How?to?use?the?computer?is?a?question.6.When?to?go?therehas?not?been?decidedyet.Lead-in動(dòng)詞不定式作主語(yǔ)有三種形式：1.直接放在________作主語(yǔ),表示具體的某次動(dòng)作，謂語(yǔ)動(dòng)詞用單數(shù)；2.為了保持句子平衡，用________作形式主語(yǔ)，放在句首，把真正的主語(yǔ)—?jiǎng)釉~不定式置于句后；3.和____________________________________________________________________構(gòu)成短語(yǔ)作主語(yǔ)。句首it疑問(wèn)詞who,whom,whose,what,which,when,

where,how等連用Summary2DiscovertheRules1.Toseeisto

believe.2.To

do

this

isto

cut

the

foot

to

fit

the

shoe.3.To

say

isonethingandto

do

isanother.4.To

make

a

detailed

plan

isagoodideatomakeitsuccessful.從位置上看，動(dòng)詞不定式作主語(yǔ)，通常放在句首。當(dāng)句子主語(yǔ)和表語(yǔ)都是非謂語(yǔ)時(shí)，通常要_________，例如：Toseeistobelieve.=Seeingisbelieving.保持一致Discover1Rule1Lead-in1.Forhimtoadmithismistakesisnoteasy.

2.Forustofinishthecompositioninaquarterofanhourisreallydifficult.動(dòng)詞不定式作主語(yǔ)可以帶上自己的____________，一般用for/of短語(yǔ)來(lái)表示。但此時(shí)多使用形式主語(yǔ)it來(lái)引起，使得句子保持平衡。例如，第2句可以改為：Itisreallydifficultforustofinishthecompositioninaquarterofanhour.邏輯主語(yǔ)Discover2Rule21.Tobeworkingalldaylongisabore.

2.Tohavemadethesamemistaketwiceisunforgivable.3.Toloveandtobelovedisthegreathappiness.動(dòng)詞不定式作主語(yǔ)可以有不同的___________形式，例如，______________________，_____________________和_____________________語(yǔ)態(tài)。時(shí)態(tài)和語(yǔ)態(tài)一般進(jìn)行時(shí)(tobedoing)完成時(shí)(tohavedone)被動(dòng)(tobedone)Discover3Rule31.Itisn’trighttotalklikethat.

2.It’sdifficulttomasterEnglish.3.It’shardformetoanswerthequestion.4.Itisbettertohavelovedandlostthannevertohavelovedatall.以上四個(gè)句子有兩點(diǎn)共同之處：1.句子的真正主語(yǔ)都是____________，但都使用it作形式主語(yǔ)；2.句子的表語(yǔ)都是______。動(dòng)詞不定式形容詞it+be+adj+(邏輯主語(yǔ))+todosthDiscover4Rule41.Itisn’trightforustostophalfway.

=Tostophalfwayisnotright.2.It’skindofyoutothinksomuchofus.

=Youarekindtothinksomuchofus.Discover5Rule5動(dòng)詞不定式的邏輯主語(yǔ)常用__________來(lái)表示，當(dāng)形容詞修飾動(dòng)詞不定式時(shí)，此時(shí)常用介詞_____。當(dāng)表語(yǔ)形容詞表示不定式的邏輯主語(yǔ)的性質(zhì)或特征時(shí)，則用介詞____。for/of+sbforof1.It’sourduty

todothat.

2.It’samistakenottohelpthem.

3.Itmustbegreatfun

toflytothemooninaspaceship.以上三個(gè)句子的表語(yǔ)都是_______，它們可歸納為一個(gè)共同句式：_________________________。

名詞it+be+n+todosthDiscover6Rule61.Ittookmemorethananhourtodomyhomeworkyesterdayevening.2.It

will

takeusalongtimetowalkthere.3.Howlongdoesittaketogetthere?

4.Howmuchdiditcostyoutosendthepackage?以上四個(gè)句子是動(dòng)詞不定式作真正主語(yǔ)，由

it作形式主語(yǔ)引導(dǎo)的句子，它們的謂語(yǔ)是_________。它們的共同句式是________________________________________，表示某人花多少時(shí)間或金錢做某事。

take/costittakes

(costs)sbsometime

/moneyto?do?sthDiscover7Rule71.Howtousethecomputerisaquestion.2.Wheretoputthebikes

isbeingdiscussed.3.Whenandwheretohavethemeetinghasnotbeendecided.________和動(dòng)詞不定式構(gòu)成不定式短語(yǔ)作主語(yǔ)。疑問(wèn)詞包括疑問(wèn)代詞who、whom、what、which、whose以及疑問(wèn)副詞when、where和how。此外連接詞whether也適用。此時(shí)，疑問(wèn)詞+todo結(jié)構(gòu)可以轉(zhuǎn)化為一個(gè)_______，例如：Howtousethecomputerisaquestion.

=___________________________________________疑問(wèn)詞主語(yǔ)從句Howwecanusethecomputerisaquestion.Discover8Rule8Lead-in動(dòng)名詞作主語(yǔ)表示_______________的行為;不定式作主語(yǔ)表示_______________________動(dòng)作。1.______(do)morningexercisesregularlyisgoodforyourhealth.

2.Itfeelsreallygood______(do)morningexercisestoday.Doingtodo經(jīng)常性或習(xí)慣性具體的、一次性的或?qū)?lái)的Completethefollowingsentencesandcomparetheirusages.Conclusion3PracticeLead-in1.Howlongdoesittakeforyou_______(get)therebybike?

2.Howmuchdiditcostyou_______(send)thepackagetoBeijing?3.It’simportant_______youtowalkaftersupper.4.It’sveryrude______youtoturnyourbacktoyourteacherandrefusetoanswer.在空白處填入1個(gè)適當(dāng)?shù)膯卧~或括號(hào)內(nèi)單詞的正確形式。togettosendforof5.Tomakefriendswiththesenaughtyboys_______(be)nice.?6.When______(hold)

themeetinghasnotbeendiscussedyet.7.Itseemedapity_____________(waste)somuchtimeonthetaskwithoutachievingourgoal.8.Tochangeor____________(change)isaquestionwehavetothinkabouteveryday.Lead-in?toholdistohavewastedtobechangedLead-in

1.明天是否下雨，無(wú)關(guān)緊要。

2.車不用時(shí)，及時(shí)鎖好很有必要。

3.這個(gè)老人對(duì)蛇的憐憫導(dǎo)致了他的死亡。

Itdoesn’tmatterwhethertorainornottomorrow.Itisnecessarytolockyourcarintimewhennotusingit.Fortheoldmantotakepityonthesnakeleadstohisdeath.翻譯句子。Lead-in4.減少工業(yè)污染，清潔水質(zhì)，花費(fèi)了多年工作才完成。5.對(duì)于像這樣的一家公司，雇用安保人員是標(biāo)準(zhǔn)做法。Ittookyearsofworktoreducetheindustrialpollutionandcleanthewater.It’sstandardpracticeforacompanylikethisonetoemployasecurityofficer.Lead-in在空白處填入1個(gè)適當(dāng)?shù)膯卧~或括號(hào)內(nèi)單詞的正確形式。Ihadavarietyofhobbies____________Istudiedincollege.Itwashardforme______(save)muchmoneytokeepmyhobbiesanditwasalsofoolish____metospendplentyoftimeonthose