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1、新概念英语第一册课后练习题及答案：85-86Wr i tten exerc i ses 书 面练习A Look at these two sentences.注意以下两个例句。She has a I ready a i red the room.She ai red it th i s morn i ng.In which of these sentences can we put has?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。1 She just boi led an egg.2 She boi led it a minute ago.3
2、 She never been to Ch i na, but he was there i n 1992.4 He a I ready pa i nted that bookcase.5 He painted it a week ago.6 She empt i ed the basket th i s morn i ng.7 He just dusted the cupboard.B Rewr ite these sentences.模仿例句改写以下祈使句。Example:Ai r the room! (th i s morn i ng)Ive a I ready a i red the
3、room.I ai red the room th i s morn i ng.1 Clean your shoes! (Iast night)2 Open the window! (an hour ago)3 Sharpen your penci I! (a minute ago)4 Turn on the television! (ten minutes ago)5 Boi I the milk! (yesterday morning)6 Empty the basket! (yesterday)7 Ask a question! (two minutes ago)8 Type that
4、Ietter! (thi s morn i ng)9 Wash your hands! (five minutes ago)10 WaIk across the park! (an hour ago)11 Paint that bookcase! (a year ago)12 Dust the cupboard! (thi s afternoon)答案：Lesson 861 She has just boi led an egg.3 She has never been to Ch i na, but he was there in 1992.4 He has a I ready pa i n
5、ted that bookcase.7 He has just dusted the cupboard.1 Ive a I ready cIeaned my shoes. I cIeaned my shoes Iast n i ght.2 Ive a I ready opened the window. I opened the window an hour ago.3 Ive a I ready sharpened my penci I. I sharpened my penci I a minute ago.4 Ive a I ready turned on the teIev i s i
6、 on. I turned on the television ten minutes ago.5 I ve a I ready boi led the milk. I boi led the milk yesterday morning.6 Ive a I ready empt i ed the basket. I empt i ed the basket yesterday.7 Ive a I ready asked a quest i on. I asked the question two minutes ago.8 Ive a I ready typed that Ietter. I
7、 typed that Ietter thi s morni ng.9 Ive a I ready washed my hands. I washed my hands five minutes ago.11 Ive al ready that bookcase a12 Ive a I ready10 Ive a I ready waIked across the park. I waIked across the park an hour ago.year ago.pa i nted that bookcase. I pa i nted dusted the cupboard. I dusted the cupboard th i s afternoon.