Unit4AGlimpseoftheFuturePeriod2Grammar课件高中英语选择性

外研选择性必修第三册Unit4Period2Grammar12Toknowsubject-verbagreementinpersonandnumberTousesubject-verbagreementinpersonandnumbercorrectly目标一：Toknowsubject-verbagreementonpersonandnumberActivity1:Lookatthesentencesfromthereadingpassageandanswerthequestions.a...50percentofmytimewasspentresearchingnewrestaurants.b

Everyrecommendationshegivesmeisgreat...c...almost50percentofUSjobsareatriskfromautomationinthenext20years.d...noneofusispreparedforthechallengesofAI.1Whyis50percentsingularinsentence(a)butpluralinsentence(c)?Becauseinsentence

(a),thepart

“50percent”

isfollowedbytheuncountablenoun

“time”,

whileinsentence

(c),thepart

“50percent”

isfollowedbythecountablenoun

“job”

initspluralform.2Whatarethesubjectsinsentences(b)and(d)?Aretheysingularorplural?Insentence

(b),thepart

“Everyrecommendation”isthesubject.

Insentence

(d),thepart

“noneofus”

isthesubject.

Botharesingular.NowLookformoresentencesfollowingthisruleinthereadingpassage,andsummarisetheuseofsubject-verbagreementinyourownwords.Nearlyeveryjobis

potentiallyatriskinthelongrun.IbelievemostofthevalueofAIliesin

itscapacitytoanalyseandinterpretvastamountsofdata,...【语法精讲】主谓一致是指主语和谓语在人称和数等方面的一致，当主语是不定代词或含有修饰语时，谓语动词的形式要依据主语所表达的单、复数概念而定，而不仅仅是取决于简单的外在形式。1）当主语被分数（百分数）、表示量的词汇等修饰时，谓语动词的形式要依据主语本身进行判断，如果主语本身是可数名词单数或者不可数名词，则谓语动词要用单数形式；如果主语是可数名词复数，或主语加上修饰语后整体表达的意义是复数概念，那么谓语动词要用复数形式。例如：a.Aboutone-thirdofthebooksinthelibraryaredonatedbystudentswhograduatedfromtheschool.book是可数名词，在句中是复数形式，并且句中着重于书的数量而不是将书视作整体，因此“三分之一的书”表达的意义是复数概念，谓语动词用are。b.Around10percentoftheforestisdestroyedeachyear.本句中的theforest为可数名词的单数形式，泛指森林，因此“10%的森林”视作一个整体，谓语动词用is。c.Alargenumberofpeoplehaveappliedforthejob.本句中的people为集体名词，表示复数概念，因此谓语动词用have。2）当主语被不定代词修饰或主语本身是不定代词时，谓语动词的形式需要根据主语加上修饰语后整体表达的意义来进行判断。例如：a.Everymeanshasbeentriedoutwithoutmuchresult.everymeans强调每一种方法，故谓语动词用单数形式。b.Alloftheworkisdonebyme.work表示“工作”时为不可数名词，故allofthework视作整体，谓语动词用单数形式。3）当主语被否定词修饰或主语本身是否定词时，谓语动词一般用单数形式。例如：a.Nobodyhasgotaticket.b.Nothingwasavailable.注意，当none作主语或主语被none修饰时，谓语动词一般用单数形式，但如果主语为可数名词复数，在非正式表达中，谓语动词也可用复数形式。例如：a.Noneofthepizzaisleft.b.Noneofthepassengerswas/wereawareofthedanger.目标二:Tousesubject-verbagreementcorrectly

Activity1:Completethepassagebychoosingthesingularorpluralform.Nowadays,somecompaniesoffergenetictestingforchildren’stalents.Alargenumberofclientshave/hasbeenattractedtoit.Theyareparents,eagertoknowwhattalentstheirchildrenmayhaveinthefuture.Theprocessissimple.Every

childprovide/providesasmallsampleofbloodorbodytissue.Thisis/Theseareanalysed.Eachofthechildrenis/aregivenareportshowingtheirpossibletalents.Arecentexamplecitedonthewebsiteisthatoneofthetestingcompaniescompare/comparesthetalentsoftwinsBobby

andBenny.Bobbywasassessedandhistalentswas/wererevealedtobemostlyscientific:a66%chanceofsuccessinchemistryand54%inphysicswas/wereshown.Meanwhile,Benny’shighestscorewas/wereshowntobeinanartssubject:thetestgavehim68%forliterarystudies.

Isgenetictestingreliable?Somescientistssaythatmoreevidenceis/areneeded.Activity2:Completethedescriptionaccordingtothecharts,payingattentiontosubject-verbagreement.Threequartersofthesurfaceismadeupofland,...Sample:Threequartersofthesurfaceismadeupofland,whiletherestissea,covering25%ofthesurface.

Halfofthelandiscoveredwithtrees.Residentialareaandarablelandbothaccountforthesame

proportion,20%ofthetotalland.Therestisdesert,covering10%ofthetotalland.

Therearethreekindsofpeople.Fiftypercentofthepeopleareoriginalresidents,30%arefromEarthand20%arefromotherplanets.Activity3:Describeanotherplanetforthefuture,payingattentiontosubject-verbagreement.Ontheplanet,halfofthesurfaceismadeupofland,theotherhalfissea.Onethirdofthelandiscoveredwithtrees.Residentialare