Unit 8 Let's Communicate!Section A Grammar focus 课件 2025-2026学年人教版八年级英语上册

Unit8Let’sCommunicate!SectionAGrammarfocusLearningobjectives掌握if引导的条件状语从句的核心规则，包括从句与主句的位置关系和时态规律；能区分if引导的条件状语从句与宾语从句的含义、位置及时态差异；能独立完成从句时态填空、句子匹配、句型转换等练习，准确运用“主将从现”等规则；能根据“校园生活”“聚会邀请”“团队训练计划”等场景，仿写或创编包含if条件状语从句的句子及简短语篇；能准确判断句子中if从句的类型，清晰阐述判断依据，提升语法应用的精准度。能够根据文本形态及内容推断出与之相关的交流方式与交际情境，并在语境中正确运用条件句描述未来可能发生的事情。Warming-up

Let’senjoyasong.Ifyou'rehappyandyouknowitclapyourhandsIfyou'rehappyandyouknowitclapyourhandsIfyou'rehappyandyouknowitandyoureallywanttoshowitIfyou'rehappyandyouknowitclapyourhandsIfyou'rehappyandyouknowitstampyourfeetIfyou'rehappyandyouknowitstampyourfeetIfyou'rehappyandyouknowitandyoureallywanttoshowitIfyou'rehappyandyouknowitstampyourfeetIfyou'rehappyandyouknowitshout“Hurray”Ifyou'rehappyandyouknowitshout“Hurray”Ifyou'rehappyandyouknowitandyoureallywanttoshowitIfyou'rehappyandyouknowitshout“Hurray”Conditionalsentences条件状语从句条件状语从句表示在……条件下某事才能发生，从句是主句动作发生的前提或条件，通常由连词if引导，意为“如果”。Readthesentence.Ifyouwanttosolvetheproblem,aface-to-facetalkusuallyworksthebest.Textingcanmakethingsworseifyou’renotcarefulwithyourwords.Iftherehearsalendsat7:00p.m.,I’llpickyouupat7:15p.m.Ifyoustaycalmandsaysorry,itwillhelp.IfIgothere,Iwilltryallthedeliciouslocalfood.if引导的条件状语从句if引导的是从句从句在前，从句后要有逗号主句在后从句在后，主句在前，中间没有逗号位置用法If引导的条件状语从句包含零条件句和第一条件句。一般表示普遍存在的事实、真理或习惯行为。条件成立时，结果必然出现，不存在任何不确定性。零条件句：第一条件句：用于表示在特定条件下可能会发生的情况。结果的实现是有条件的，且这个条件有实现的可能性。Zeroconditionals零条件句描述客观事实、自然规律、普遍真理或习惯性行为。条件成立时，结果必然发生。If+一般现在时，主句+一般现在时。e.g.Ifyouheatwaterto100°C,itboils.

如果你把水加热到100°C，它就会沸腾。

Ifthesunsets,itgetsdark.

如果太阳落山，天就会变黑。结构：客观事实自然规律时态时态If

you

like

sightseeing,you

willlove

it!Ifyouwalk

alongtheBund,youwillseemanyoldbuildings.主句用一般将来时，从句用一般现在时，即“主将从现”。

表示在特定条件下可能会发生的情况、结果或行为。表达将来可能发生的条件和结果，结果发生的可能性较高。Firstconditionals第一条件句If+一般现在时，主句+一般将来时。时态YoucanalsoseefamousbuildingsarounditifyouvisitPeople'sSquare.Youshouldstudyhardifyouwanttomakeyourdreamcometrue.主句用一般将来时，从句用情态动词，即“主情从现”。If+一般现在时，主句+情态动词may,might,can,must,should等的句子。时态Havearestifyoufeeltired.Pleaseletmeknowifshecomesback.主句用一般将来时，从句用祈使句，即“主祈从现”。If+一般现在时，主句+祈使句。归纳条件状语从句用法talkaboutpossibleactionsandtheresultsoftheseactions位置主句在前，从句在后，中间没有逗号。从句在前，主句在后，中间有逗号。时态主将从现主情从现主祈从现主现从现Zeroconditionals零条件句Firstconditionals第一条件句1.借助“祈使句+and/or+句子（一般将来时）”句型来转换。and在句意上表示顺承，意为“那么，就”；or表示转折，意为“否则”。e.g.Ifyougetupearly,you’llcatchtheschoolbus.=Getupearly,andyou’llcatchtheschoolbus.=Getupearly,oryouwon’tcatchtheschoolbus.

早点起床，你就会赶上校车。借助without或with来转换条件状语从句。e.g.Ifthereisnosunshine,plantswilldie.=Plantswilldiewithoutsunshine.

如果没有阳光，植物将会死亡。

Ifyouhelpme,I’llgetbettergrades.=Withyourhelp,I’llgetbettergrades.

如果你帮助我，我将取得更好的成绩。Ifyouwanttosolvetheproblem,aface-to-facetalkusuallyworksthebest.Textingcanmakethingsworseifyou’renotcarefulwithyourwords.Iftherehearsalendsat7:00p.m.,I’llpickyouupat7:15p.m.Ifyoustaycalmandsaysorry,itwillhelp.IfIgothere,Iwilltryallthedeliciouslocalfood.Whatarethetensesofthemainclause(主句)andthesubordinateclause(从句)?一般现在时一般现在时一般现在时含情态动词的一般现在时一般现在时一般将来时一般现在时一般将来时一般现在时一般将来时Ifyouwanttosolvetheproblem,aface-to-facetalkusuallyworksthebest.Textingcanmakethingsworseifyou’renotcarefulwithyourwords.Iftherehearsalendsat7:00p.m.,I’llpickyouupat7:15p.m.Ifyoustaycalmandsaysorry,itwillhelp.IfIgothere,Iwilltryallthedeliciouslocalfood.zeroconditionalsentence零条件句firstconditionalsentence第一条件句Findmoresentenceswith

if-clausesinSectionA."Ifyoucan'tmeet,justcallyourfriend.""Ifitisstillhardtotalk,takeabreak.""Ifyoucancome,I'llbeveryhappy.""Ifyouwanttomakesomenewfriends,thisisagoodchance.""Ifyoutalkto...,Ithinkhe/shewillbehappytohelpyou."Matchthetwopartstomakesentences.1.Ifwehaveaface-to-face

meeting,2.IfIhavegoodnews,3.Ifyouneedtoleave,4.Ifyoucanfinishyourworkearly

today,5.Iftheoldmanhasdifficultiesin

hearing,6.Ifyoucan’treachherbyphone,A.trytexting.B.we’llunderstandeach

otherbetter.C.youcanwritethingsdown

forhim.D.I’llcallyourightaway.E.I’llcallataxiforyou.F.willyoujoinmefordinner?difficultyn.困难；难题havedifficulty(in)doingsth.做某事有困难(介词in可以省略)Iftheoldmanhasdifficultiesinhearing,youcanwritethingsdownforhim.如果这位老人听力有困难，你可以把事情写下来给他看。当表示做一件事的困难程度时，常作不可数名词，其前可用some，no等词修饰当表示具体的困难、难处、难点时，作可数名词。e.g.IhavegreatdifficultywithEnglishgrammar.我在英语语法方面有很大困难。Jackhasagoodmemory.Hehasnodifficulty(in)remembering

thesewords.Jack记忆力很好，他记这些单词毫不费力。Davidcanalwaysfaceallkindsofdifficulties.David总是能够勇敢地面对各种困难。Scanthepassagesandanswerthequestions.Whatkindoftextsarethey?Whatformsofcommunicationaretheyconnectedwith?notevoicemessagesFillintheblankswiththecorrectformsoftheverbsinbrackets.Thendiscusswhatthesituationsareandwhomtheinformationisfor....Ifthings________(go)well,we________(see)allthoseoldfacesagain.Justthinkhowgreatitwillbe!Ifyouthinkyoucancome,________(drop)mealineandI________(give)youallthedetailsaboutthereunion.Butpromisemeyou’llthinkaboutitseriously.gowillweedropwillgivesituationwhomSomeonethespeakerwantstoinvitetoareunion.It'saboutareunion.Thespeakerisinvitingsomeone.Hey,it’sme.Iwantedtotalktoyouaboutthetrainingplanforourteam.Thenewseasoniscoming,soit’stimetomakeaplanfo