新概念英语第二册期末复习——英语条件从句(16张PPT).pptxVIP

ConditionalSentencesStructure:Aconditionalsentenceiscomposedof2parts:If-clause+MainClauseExample:Ifitrainstomorrow,wewillnotcome.If-clauseMainClause

ConditionalSentencesTypes:Thereare4typesofconditionalsentences.Theyareclassifiedaccordingtotheirspecificimplications.Eachtypeofconditionalsentencesusesdifferenttensestoshowthedifferenceintheirimplications.

ConditionalSentencesType0:Use:Talkaboutuniversaltruth.Tense:PresenttenseinbothclausesExample:Ifyouheatwaterto100°C,itboils.PresentTensePresentTenseIfyoupouroilintowater,itfloats.

ConditionalSentencesType1Use:Talkaboutapresentorfutureprobablecase.Tense:If-clause~PresentTenseMainClause~FutureTenseExample:IfIfeelsick,Iwillnotgotoschool.PresentTenseFutureTenseIfitrainstomorrow,thematchwillbecancelled.

ExerciseOneIfyou___________________(notcome),You________________(miss)theshow.donotcomewillmissJohn__________________(buy)acarifhe_____________(get)ajob.willbuygetsMary________________(get)atoothacheifshe_________________(eat)toomanysweets.getseats

ConditionalSentencesType2(PresentSubjunctive)Use:Talkaboutapresentorfutureimprobablecase.(Acasethatisunlikelytohappen)Tense:If-clause~PastTenseMainClause~would+aninfinitiveExample:Ifhewereabird,hewouldflyacrosstheharbour.PastTenseWould+infinitiveIfIhad$200,000now,Iwouldbuyacar.

ConditionalSentencesType3(PastSubjunctive)Use:Talkaboutapast,impossiblecaseTense:If-clause~PastPerfectTenseMainClause~Would+PresentPerfectFormExample:IfIhadhadenoughmoney,Iwouldhaveboughtthecamerayesterday.PastPerfectTenseWould+PresentPerfectFormIfIhadcomehomeearlier,Iwouldnothavemissedtheprogramme.

ExerciseTwoIfI________________(be)fouryearsold,I________________(learn)toplaythepiano.w