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1 Why are English people indirect?

I wonder why English people are indirect.

2 Is it polite to use an older person's first name?

Could you tell me if it is polite to use an older person's first name?

3 Is it OK to ask someone how much they earn?

I don't know if it's OK to ask someone how much they earn.

4 Do I have to send a Christmas card to everyone I know?

I'd like to know if I have to send a Christmas card to everyone I know.

5 What time should I arrive if my invitation says 8 p.m.?

Would you mind telling me what time I should arrive if my invitation says 8 p.m.?

6 How big a tip should I leave in a restaurant or café?

Have you any idea how big a tip should I leave in a restaurant or café?

7 Can I use my host's telephone without asking first?

I wonder if I can use my host's telephone without asking first.