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新概念英语第一册课后练习题及答案：85-86
Written exercises 书面练习 A Look at these two sentences. 注意以下两个例句。
She has already aired the room. She aired it this morning.
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 boiled an egg. 2 She ______ boiled it a minute ago.
3 She ______ never been to China, but he was there in 1992.
4 He ______ already painted that bookcase. 5 He ______ painted it a week ago.
6 She ______ emptied the basket this morning. 7 He ______ just dusted the cupboard. B Rewrite these sentences.
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模仿例句改写以下祈使句。 Example：
Air the room! (this morning) I've already aired the room. I aired the room this morning. 1 Clean your shoes! (last night) 2 Open the window! (an hour ago)
3 Sharpen your pencil! (a minute ago) 4 Turn on the television! (ten minutes ago) 5 Boil the milk! (yesterday morning) 6 Empty the basket! (yesterday) 7 Ask a question! (two minutes ago) 8 Type that letter! (this morning) 9 Wash your hands! (five minutes ago) 10 Walk across the park! (an hour ago) 11 Paint that bookcase! (a year ago) 12 Dust the cupboard! (this afternoon)__________________________________________________
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答案： Lesson 86
1 She has just boiled an egg.
3 She has never been to China, but he was there in 1992.
4 He has already painted that bookcase. 7 He has just dusted the cupboard.
1 I've already cleaned my shoes. I cleaned my shoes last night.
2 I've already opened the window. I opened the window an hour ago.
3 I've already sharpened my pencil. I sharpened my pencil a minute ago.
4 I've already turned on the television. I turned on the television ten minutes ago. 5 I've already boiled the milk. I boiled the milk yesterday morning.
6 I've already emptied the basket. I emptied the basket yesterday.
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7 I've already asked a question. I asked the question two minutes ago.
8 I've already typed that letter. I typed that letter this morning.
9 I've already washed my hands. I washed my hands five minutes ago.
10 I've already walked across the park. I walked across the park an hour ago.
11 I've already painted that bookcase. I painted that bookcase a year ago.
12 I've already dusted the cupboard. I dusted the cupboard this afternoon.
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