Answers:
`1.` I haven't seen your uncle recently.
`2.` Do you know what the pudding made from?
- No. My mother often cook it at Christmas, but I never have never asked her about it.
`3.` Linh’s brother lost his job last month, and since then he has been out of work.
`4.` He should know how to use the lift, but if he doesn’t you’d better show him.
`5.` Please go on writing; I don’t mind waiting.