When you ask for things, it is important to be polite. The intonation¹ that you use in making your request² is as important as what you actually say. When you think someone will refuse your request, you can ask the question in such a way that the refusal³ does not cause embarrassment⁴.

1. A: Is there any chance of my borrowing your type-writer?
    B: For how long? 
    A: Until the end of the week. 
    B: Yes, I guess that would be all right.

2. A: Would you mind if I borrowed your car? 
    B: Well, when exactly? 
    A: Until Monday or Tuesday of next week. 
    B: I'm sorry, but it's just not possible.

3. A: Do you think you could lend me some of your records? 

 B: Until when? 
    A: Oh, just over the holidays. 
    B: I'm not sure. I'll have to think about it.

4. A: I was wondering if you'd let me stay with you for a few days. 
    B: It really depends on when. 
    A: Until next weekend, if that's OK. 
    B: Let me think it over, and I'll let you know later.