Unit7TheunknownworldGrammarThepoliceofficeraskedTomsomemorequestionsaboutthealiens.Matchthequestionswiththeanswers.Thenusethemtocompletethepoliceofficer’snoteswithas,sinceorbecause.badcAdverbialclausesofreason(原因狀語(yǔ)從句)telluswhythingshappen.Weusuallyusebecause,asandsincetostartadverbialclausesofreason.Adverbialclauseofreason(原因狀語(yǔ)從句)Mainclause(主句)Becausenooneelsesawthesealiens,Irefusedtobelieveyou.AsSinceMainclause(主句)Adverbialclauseofreason(原因狀語(yǔ)從句)Irefusedtobelieveyoubecausenooneelsesawthesealiens.assince從句在句首時(shí)，中間用逗號(hào)與主句隔開語(yǔ)法解析：

because,as,since連詞，構(gòu)成原因狀語(yǔ)從句，不能與so連用。語(yǔ)氣:because＞

since＞

as

區(qū)別：

because

(1)因?yàn)椋脀hy問，用because答。

(2)because+

句子

becauseof+

n./代詞2.since

(1)因?yàn)?，既?/p>

Sinceeveryoneishere,let’sstart.(2)自……以來(lái)。時(shí)間狀語(yǔ)從句

We’veknowneachothersincewewerechildren.3.as(1)由于，因?yàn)?/p>

Wealllikeherassheiskind.

(2)=when,當(dāng)……的時(shí)候。時(shí)間狀語(yǔ)從句

Hedroppedtheglassashestoodup.1.他因?yàn)橐粓?chǎng)事故失去了雙親。

Helosthisparents_____________anaccident.2.既然你已經(jīng)在這兒了，何不多待兩天？

_________youarehere,whynotstayfortwomoredays?3.你生病了，最好去看醫(yī)生。

_______youareill,you’dbettergotoseeadoctor.4.我沒去那里，因?yàn)槲也幌胍姷剿?/p>

Ididn’tgothere_________Ididn’twanttoseehim.5.由于要趕去火車站，他們很早就起床了。

_______theyneededtogotothetrainstation,theygotupearly.becauseofSinceAs/SincebecauseAs()1.Hedidn’tpasstheexam____hedidn’tstudyhard.A.forB.becauseC.sinceD.so()2.Whatshallwehaveforlunch_____wedon’tgoshoppingnow?A.whenB.beforeC.unlessD.if()3.Thepolicemanpraised(表?yè)P(yáng))me,____helpingtheblindmancrossthestreet.A.becauseB.forC.withD.as()4.____therearetoomanypeoplehere,wehavetofindanotherhouse.A.BecauseB.ThoughC.SinceD.If()5.I’llgiveherthemassage____shecomesback.A.tillB.beforeC.sinceD.assoonasBDBCD()6.____heisveryyoung,heknowsseverallanguage.A.ThoughB.BecauseC.AsD.Since()7.Theydidn’tstartthework____theirteachercameback.A.untilB.whileC.assoonasD.if()8.Helostthegame_____hiscarelessness.A.inordertoB.becauseofC.accordingtoD.fullof()9.Annisnotactiveandshewon’tjoinus___sheisaskedto.A.whenB.becauseC.unlessD.if()10.____it’sgettingdark,let’sgohomenow.A.BecauseB.WhenC.IfD.AsAABCD()1.-----Whydidn’tyougototheparty?-----_______Iwasn’tinvited.A.AsB.SinceC.BecauseD.So()2.Thebabyissleeping,______you’dbetterkeepquiet.A.butB.orC.becauseD.