Read and practice the following dialog with your partner.

Fredi is phoning his friend, Tia.

Fredi: Hello, Tia, It's Fredi.

Tia: Oh, Hello Fredi. What are you doing?

Fredi: Nothing much. I was revising but I had to stop because my computer is not working.

Tia: Oh dear. Well, I am not using mine. Would you like to come and borrow it?

Fredi: That's a very kind of you.

Tia: When are you going to come to my house?

Fredi: Is it ok if l come to your house at 7 o'clock tomorrow night?

Tia: I am sorry, I will be having dinner with my family.

Fredi: How about 7.30?

Tia: That's fine.

Fredi: Thanks. Bye.

Tia: Bye.

Whose computer is not working?