狀語從句課件

狀語從句教師點撥考點精講1時間狀語從句狀語從句的結(jié)構(gòu)(以when為例)：1．When＋從句(，)＋主句2.主句(，)＋when＋從句一、連詞：when,while,as,before,after,till,until,since,assoonas等。二、when與while的區(qū)別：when＋短暫性動作(常為一般時)或延續(xù)性動作(常為進(jìn)行時)；while＋延續(xù)性動作(常為進(jìn)行時)。如：WhenIstoppedmycar,apolicemancameuptome.MywifewascookingwhenIgothome.Iwasdoingmyhomeworkwhen/whilemyfatherwaswatchingTV.While/Whenweweretalking,theteachercamein.教師點撥三、till,until用法：既可以用于肯定句也可用于否定句，可以互換。如：Istayedtheretill/untilIwasaskedtoleave.Ididn'tleavetill/untilIwastoldto.四、since一般用于完成時。如：Ihaven'tgotintouchwithmyparentssinceIpartedwiththeminApril.ShehasworkedheresinceshecametoGuangdongthreeyearsago.教師點撥五、如果主句是將來時、祈使句或者表將來的情態(tài)動詞句時，從句用一般現(xiàn)在時，有時可用現(xiàn)在完成時，即所謂的“主將從現(xiàn)”的原則。如：Don'tgetoffthebusuntilthebushasstopped/stops.IwillwritetoyouassoonasIarrive/havearrived.Canyousendmeane-mailwhenyougethome?注意：while還可以用來表達(dá)對比(不是時間狀語從句)。MysisterlikesmathwhileIamfondofEnglish.(相當(dāng)于并列句中的and或but)TomisgoodatthepianowhileSam(isgoodat)theviolin.教師點撥考點精講2原因狀語從句連詞：because,since,as等。because表示很強(qiáng)的原因；since/as表示較弱的、不直接的原因，可以譯成“既然”。IamworriednowbecauseIhaveleftmyhomeworkathome.Sinceeveryoneishere,let'sstartourmeeting.Asyoudon'tfeelwell,let'sstayathometoday.注意：because不與so連用。教師點撥考點精講3條件狀語從句一、連詞if,unless(＝if...not),aslongas(只要)。二、一定要遵循“主將從現(xiàn)”的原則。如：Wewillgoforapicnicifitisfinetomorrow.Youwon'timproveyourstudyunlessyouworkhard.＝Y(jié)ouwon'timproveyourstudyifyoudon'tworkhard.Youwillachieveyourdreamaslongasyousticktoit.教師點撥考點精講4讓步狀語從句連詞：though,although,eventhough注意：不與but連用。Hecametoseemeinsuchhotweatheralthoughheisbusy.教師點撥考點精講5目的狀語從句連詞：sothat,inorderthat等。目的狀語從句常是情態(tài)動詞句。Speakclearlysothat/inorderthattheycanunderstandyou.Igotupat5：00sothat/inorderthatIcouldcatchthefirstbus.當(dāng)主句語從句主語相同時，從句還可改成不定式結(jié)構(gòu)。如：Sheeatsmuchlessthanbeforesothat/inorderthatshecanlosesomeweight.＝Sheeatsmuchlessthanbeforesoasto/inordertolosesomeweight.教師點撥考點精講6結(jié)果狀語從句連詞：so...that,such...that等。結(jié)構(gòu)：so＋adj./adv＋that＋從句；such＋(adj.)＋n.＋that＋從句(要注意名詞的可數(shù)性及其出現(xiàn)形式)例外：somany/much/f