4.1
2 Are you going now?
3 Is it raining?
4 Are you enjoying the film?
5 Is that clock working?
6 Are you writing a letter?

4.2
2 Where is she going?
3 What are you eating?
4 Why are yoy crying?
5 What are they looking at?
6 Why is he laughing?

4.3
3 Are you listening to me?
4 Where are your friends going?
5 Are your parents watching television?
6 What is Ann cooking?
7 Why are you looking at me?
8 Is the bus coming?

4.4
2 Yes, I am or. No, I'm not.
3 Yes, I am or. No, I'm not.
4 Yes, it is. or No, it isn't. / No, it's not.
5 Yes, I am or. No, I'm not.
6 Yes, I am or. No, I'm not.