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新概念英语第一册课后练习题及答案：85-86Writtenexercises书面练习ALookatthesetwosentences.注意以下两个例句。Shehasalreadyairedtheroom.Sheaireditthismorning.Inwhichofthesesentencescanweputhas?在下面的句子中有一般过去时和现在完成时两种不同的时态。选出现在完成时的句子，并填上has。1She______justboiledanegg.2She______boileditaminuteago.3She______neverbeentoChina,buthewastherein1992.4He______alreadypaintedthatbookcase.5He______painteditaweekago.6She______emptiedthebasketthismorning.7He______justdustedthecupboard.BRewritethesesentences.模仿例句改写以下祈使句。Example：Airtheroom!(thismorning)I'vealreadyairedtheroom.Iairedtheroomthismorning.1Cleanyourshoes!(lastnight)2Openthewindow!(anhourago)3Sharpenyourpencil!(aminuteago)4Turnonthetelevision!(tenminutesago)5Boilthemilk!(yesterdaymorning)6Emptythebasket!(yesterday)7Askaquestion!(twominutesago)8Typethatletter!(thismorning)9Washyourhands!(fiveminutesago)10Walkacrossthepark!(anhourago)11Paintthatbookcase!(ayearago)12Dustthecupboard!(thisafternoon)答案：Lesson861Shehasjustboiledanegg.3ShehasneverbeentoChina,buthewastherein1992.4Hehasalreadypaintedthatbookcase.7Hehasjustdustedthecupboard.1I'vealreadycleanedmyshoes.Icleanedmyshoeslastnight.2I'vealreadyopenedthewindow.Iopenedthewindowanhourago.3I'vealreadysharpenedmypencil.Isharpenedmypencilaminuteago.4I'vealreadyturnedonthetelevision.Iturnedonthetelevisiontenminutesago.5I'vealreadyboiledthemilk.Iboiledthemilkyesterdaymorning.6I'vealreadyemptiedthebasket.Iemptiedthebasketyesterday.7I'vealreadyaskedaquestion.Iaskedthequestiontwominutesago.8I'vealreadytypedthatletter.Itypedthatletterthismorning.9I'vealreadywashedmyhands.Iwashedmyhandsfiveminutesago.10I'vealreadywalkedacrossthepark.Iwalkedacrosstheparkanhourago.11I'vealreadypaintedthatbookcase.Ipaintedthatbookcaseayearago.12I'vealreadydustedthecupboard.Idustedthecupboardthisafternoon.