新概念英語(yǔ)第一冊(cè)（美音版）Lesson 86 What have you done?

Exercise

1 has

2 \

3 has

4 has

5 \

6 \

7 has



aired/ cleaned/ opened/ sharpened/ turned on/ listened to/ boiled/ answered/ emptied/ asked/ typed/ washed/ walked/ painted/ dusted

Air the room!

I've already aired the room.

I aired the room this morning.

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.

9 I've already washed my hands. I washed my hands five minutes ago.



Boil the egg

My mother has already boiled the egg. She boiled the egg yesterday.

11 George has already painted that bookcase. He painted that bookcase a year ago.

8 Pamela has already typed that letter. She typed that letter this morning.