A

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.

B

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.

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.