Listen to the tape and answer the questions.
听录音并回答问题。
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)
