2) Can I help you?
You must be at the office at 10 to 9.
Can I ask you a question?
Can I try this dress on?
can I pay for your lunch?
I think, you must buy this dress. It's beautiful on you.
Can I have a coffee, please?
May I speak to Mary, please?
the porter can take your suitcases to your room
we must see this film.
can you really go? I'm afraid, I cannot.
Can you follow me?
I must buy a new coat.
You must not smoke, sir.