Could在疑問句中表示請求，在表達請求的疑問句中，或期望得到對方肯定回答的疑問句中，仍然用some，比如說Could you please give me some advice on how to learn English ？

Could I ask you some questions？

Could you tell me something about the movie��

要用some。

一般情況下,may i是表示向別人請求,為了表示委婉,要用some。如May I have some milk？

Some用於一般疑問句中，往往是表示委婉的請求或者希望得到對方肯定的回答。字典裡這樣解釋；

Some is used in questions that expect a positive reply.

some一般用於肯定句，any用於否定句和疑問句，但在下列幾種特殊情況下卻通常要用 some 而不用 any：

1.希望得到肯定回答的疑問句通常用 some。如：May I have some paper?我可以拿些紙嗎?Didn't he give you some money?他不是給了你一些錢嗎?Can you lend me some money? 能借點錢給我嗎?Aren't there some stamps in that drawer? 那抽屜裡不是有幾枚郵票嗎?2．表示請求或建議的疑問句通常用 some。如：Why not give her some flowers?為什麼不送她些花呢?Would you like some bananas? 吃點香蕉嗎?Won't you have some more?你不再要一點嗎?Shall I get some chalk for you? 要我給你拿些粉筆來嗎?