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 A. Asking people to do things (requests)
  We often use can or could to ask people to do things:  * Can you wait a moment, please? or Could you wait a moment, please?  * Liz, can you do me a favour?  * Excuse me, could you tell me how to get to the airport?  * I wonder if you could help me. 
  Note that we say 'Do you think (you) could ... (not usually can'):  * Do you think you could lend me some money until next week 
  We also use will and would to ask people to do things (but can/could are more  usual):  * Liz, will you do me a favour?  * Would you please be quiet? I'm trying to concentrate. 
  B. Asking for things 
  To ask for something we use Can I have ... or Could I have ...:  * (in a shop) Can I have these postcards, please?  * (during a meal) Could I have the salt, please? 
  May I have ... is also possible (but less usual):  * May I have these postcards, please? 
  C. Asking for and giving permission 
  To ask for permission to do something, we use can, could or may:  * (on the phone) Hello, can I speak to Tom, please?  * 'Could I use your phone?' 'Yes, of course.'  * Do you think I could borrow your bike?  * 'May I come in?' 'Yes, please do.' 
  May is formal and less usual than can or could.
  To give permission, we use can or may.  * You can use the phone. or You may use the phone. 
  May is formal and less usual than can or could. 
  D. Offering to do things  We use Can I ...? or May I...? when we offer to do things.  May is more formal.
  * 'Can I get you a cup of coffee?' 'Yes, that would be very nice.'  * 'Can I help you?' 'No, it's all right. I can manage.' 
  *(in a store) "May I help you?""No, thanks.I'm being helped."
  You can also use I'll ... to offer to do things :  * You look tired. I'll get you a cup of coffee. 
  E. Offering and inviting 
  To offer or to invite we use Would you like ...? (not do you like)  * 'Would you like a cup of coffee?' 'Yes, please.'  * 'Would you like to come to dinner tomorrow evening?' 'Yes, I'd love to.' 
  I'd like... is a polite way of saying what you want:  * (at a tourist information office) I'd like some information about hotels, please.  * (in a shop) I'd like to try on this jacket, please.  | 
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