请说明为什么谢谢We____(clean)theroombe-查字典问答网

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　　请说明为什么谢谢We____(clean)theroombeforeyoucame.It'stoolate.Ihaveto____(go)immediately.Whenwe____(arrive)thestation,thetrain___(leave).MustI_____(finish)myhomeworkfirst?ThesearesomephotographsthatI____(take)lastmo

　　请说明为什么谢谢

　　We____(clean)theroombeforeyoucame.

　　It'stoolate.Ihaveto____(go)immediately.

　　Whenwe____(arrive)thestation,thetrain___(leave).

　　MustI_____(finish)myhomeworkfirst?

　　ThesearesomephotographsthatI____(take)lastmonth.

　　Bytheendoflastweek,I____(read)threebooks.

　　Thefirlwhowe____(see)justnowismyclassmate.

　　Bob____(go)toschoolyesterday,becausehewasill.

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2020-01-1823:33

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倪志强

　　请说明为什么谢谢

　　Wehadcleaned(clean)theroombeforeyoucame.[beforeyoucame(在你来之前),表明动作在过去（came）以前,用过去完成时.]

　　It'stoolate.Ihavetogo(go)immediately.[haveto+动词原形,表示“不得不”]

　　Whenwearrived(arrive)thestation,thetrainhadleft(leave).[arrived(到达)是过去的动作,而火车到达发生在“arrived”之前,用过去完成时：hadleft]

　　MustIfinish(finish)myhomeworkfirst?[情态动词must后面必须接动词原形]

　　ThesearesomephotographsthatItook(take)lastmonth.[时间是“lastmonth(上个月)”,过去时间,用一般过去时.]

　　Bytheendoflastweek,Ihadread(read)threebooks.[“bytheendof+过去时间(到……末之前)”,表示“过去以前”,动词用过去完成时.]

　　Thegirlwhowesaw(see)justnowismyclassmate.[时间是“justnow(刚才)”过去时间,用一般过去时.]

　　Bobdidn'tgo(go)toschoolyesterday,becausehewasill.[时间是“yesterday(昨天)”,用一般过去时.又根据意思理解,因为“生病”所以应该“没去上学”,用否定式.]

2020-01-18 23:35:36

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