(2) Help Ss to understand the key sentences.

(3) Help Ss to sum up the rules how to change a verb into -ing form.

Step3.Pracice-Work on 1a

(1) Match the words with the activities.

(2) Talk about the picture with Ss using the target language.

Step4. Practice-Work on 1b

（1） Listen. What are these people doing? Write numbers from 1a.

　　(2) Write numbers from 1a.

Step5. Drill

Have some Ss repeat the conversation first. Then have Ss change the words.

T: Let's play a game. Two of you will repeat the conversation in the picture. Then another two will also read out the conversation but they have to change the words used.

Step6. Work on 1c

（1）Pair work

A: What's he doing?

B: He's using the computer.

A: What are they doing?

B: They're listening to a CD.

(2) Ask some pairs to present their conversations to the class.