- I'd like you/him to ..., please.
Could you..., please?
Do you think you could...?
Would you mind -ing...?

-Sorry. (Certainly.)
I'm sorry, but...
Unfortunately,...
I'm afraid I can't, because...

OFFERING TO HELP

-Would you like/Can I give you...a hand/a lift?
Would you like me to...
Shall I...
Perhaps I can help? Can I help at all?
If you need any help, just let me/us know.

-Thanks very much - if you're sure it's no trouble.
That's very kind of you, yes, could you...?
No, thanks. I can manage.
That's very kind of you, but...
No thank you. I'm just having a look/waiting for someone.

ASKING PERMISSION

-May I ...?
Do you mind if I ...?
Can I ...?
Do you think I could ...?
Is it all right if I ...?

-Yes, go ahead. (Sure.)
Certainly.
No. I'm afraid not, because...
No. I'm afraid you can't because...
No. I'm afraid we aren't allowed to...