Unit7GrammarAdverbialclausesofreasontelluswhythingshappen.Weusuallyusebecause,asandsincetostartadverbialclausesofreason.AAdverbialclausesofreason原因狀語從句Adverbialclauseofreason

Mainclauserefuseadverbial主句拒絕；回絕狀語（1）because引導(dǎo)的原因狀語從句表示的因果關(guān)系語氣最

強，常用來回答why提出的問題。如：Ididn’tgobecauseIwasafraid.（2）as引導(dǎo)的原因狀語從句時語氣最弱，它所表示的原因只是對結(jié)果的附加說明，可位于句首或句末。如：IleftamessageasJimwasn’there.

（3）since引導(dǎo)的原因狀語從句語氣次于because，

常表示稍加分析便能得出來的原因，或人們已知

的事實，意為“既然，鑒于”，常置于句首。如：

Sincetheweatherissobad,wehavetodelayourjourney.

AdverbialclauseofreasonMainclauseBecause

AsSincenoonesawelsethosealiens.Irefusetobelieveyou.Wecanalsoputtheadverbialclauseofreasonofreasonafterthemainclause.AdverbialclauseofreasonMainclausebecauseassincenoonesawelsethosealiens.Irefusetobelieveyou.Thingstoremember

Whenweputtheadverbialclauseofreasonatthebeginningofthesentence,weoftenseparateitfromthemainclausewithacomma(,)ThepoliceofficeraskedTomsomemorequestionsaboutthealiens.Matchthequestionswiththeanswers.Thenusethemtocompletethepoliceoffice’snoteswithas,sinceorbecause.1（because）Tinawassurethatsomethinglandedintheforestnearthehillsbecausesheheardaloudnoiselastnight.（as）3（Because）4（Since）Sincenooneelsesawthesealiens,fatherrefusedtobelievethem.Werunawaybecauseanaliensawusandmadeaterriblenoise.Tinahidbehindsomebushesastheyheardsomevoicesspeakingastrangelanguage.BbecauseofWecanalsousebecauseoftogivereasonthereasonforsomething.Theywenttotheforestbecauseoftheircuriosity.Tinawokeupatmidnightbecauseofaloudnoise.Shedecidedtoexploretheforestbecauseofit.

becauseofcuriositymidnightdecidetoexplore因為；由于好奇心午夜；子夜決定做……探討WorkouttheruleWecanuseanoun,anounphraseora（subjectpronoun/objectpronoun）afterbecauseof.Writesentencesaboutthestoryonpage99byusingbecauseof.1Tinawassurprised/theyellowlightinthesky2Thealienslandedonthisplanet/anaccident3Thechildrenranawayfromtheforest/thealiens4Theirdadwasnotsureaboutthechildren’sstory/thewritingonthepieceofpaperTinawassurprisedbecauseoftheyellowlightinthesky.

Thealienslandedonthisplanetbecauseofanaccident.Thechildrenranawayfromtheforestbecauseofthealiens.Theirdadwasnotsureaboutthechildren’sstorybecauseofthewritingonthepieceofpaper.because和becauseof的區(qū)別because和becauseof都意為“因為”。其用法：because是連詞，后面接句子，構(gòu)成表示原因的狀語從句；becauseof是短語介詞，后面接名詞或動詞-ing形式，在句子常用作狀語。如：

Ididn’tbuyitbecauseitwastooexpensive.我沒有買是因為它太貴了。

Heisherebecauseofyou(that).他為你(那事)而來這里。1.Herealizedshewascrying_____whathehadsaid.

a.becauseb.becauseof2.Ididn’tbuyit______itwastooexpensive.a.becauseb.becauseof3.Helosthisjo