Present Perfect or Present Perfect Continuous?

Complete the interview with the appropriate verb form.
Car culture at home

Interviewer: Sultan, you're a "driving instructor. How long........................you teach) people to drive? Sultan: Ten years, nearly eleven.

Interviewer: And how many people (2).........
(you teach) in that time?
Sultan: I don't know exactly. Hundreds. I
(teach) ..............................) all different kinds of people.

Interviewer: And what about your hobbies? Are they to do with cars, too?

Sultan: Oh yes! My youngest son is sixteen and he and ..........................(make) a car together. We hope to
finish it next year. We are also working on a
motorbike. For the last few days we

(5).....................(take) it to pieces. We

(6) ............rebuild) it completely and when

we've finished, we hope to sell it. I (7)....................(work) a lot recently so we

(8) ........... . (not do ) as much on the bike as we hoped.

Interviewer: There's quite a car culture in your house. What about your older son? Does he like cars?

Sultan: Oh, he's a driving instructor too. He (9)...................(not teach) as long as I have

(10) ............(not teach) as many pupils.
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