Problem: Given the question: W: OK. Well, first of all, you have to plug it into the power supply. M: Yeah, I see. W: Once you've done that... you don't need to switch anything on. M: How do you open it? W: Well, you have to press the little button that says eject. M: This one here? W: That's right. That's it. M: Like that? W: Yeah. After you've clone that, then you load the cassette. Make sure that you've got the right side of the tape facing you and not away from you. Then you should close the cassette flap. M: Like that? W: Yeah, that's right. And then you must remember to press the play button to set it to work. M: That one on the right? W: Yes, that's it. M: Like that? W: Right! It won't go clown unless you push hard. M: I know. Those old models are all like that. W: That's just what you must do. M: Yes. But how about this red thing here? W: That's the record switch. Be careful not to press it when you're playing, because if you do you'll wipe off whatever is on the tape. M: Oh, I see. So that's the record and this is the rewind. W: Exactly. If you want to rewind, then you have to press it down. M: And then stop it here. W: That's it. You've got it. What was said before this conversation?
++++++++++++++++++++++++++++++++
The answer is:
M: Um, Mary, could you cell me how to use this cassette recorder, please?

Problem: Given the question: M: Yes, sort of. W: Then perhaps you can help me. I need to use a computer to type an assignment. M: Well, are you a student? W: Yes, I am. First year. M: Ok. Have you used a computer before? W: Yes, I've done a bit of word processing. M: That's good. You can use a computer for 2 hours at a time. W: Mm. What can I do if something goes wrong with the computer? M: There's usually someone here from 9 o'clock. You can ask him for help. What was said before this conversation?
++++++++++++++++++++++++++++++++
The answer is:
W: Excuse me. Are you in charge here?

Problem: Given the question: M: Sorry, my classmates already asked for them. What was said before this conversation?
++++++++++++++++++++++++++++++++
The answer is:
W: I've noticed that you got some letters from Canada. Would you mind saving the stamps for me? My sister collects them.