新概念英语1课文原文：Lesson 86 What have you done?你已经做了什么?

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新概念英语1课文原文：Lesson 86 What have you done?你已经做了什么?

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.

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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