各位又要你地幫幫手

都可以，全視乎你要問甚麼。Do you want to be a millionaire? 你想成為百萬富翁嗎？Do you - 是在問你本人事否有「成為百萬富翁」的想法，而不是在提供選擇。（做唔做到百萬富翁，基本上是沒得揀吧？）Would you like some coffee? 你想要些咖啡嗎？Would you是禮貌。do you want都可以，語氣比較neutral。Do you need counseling? 你需要專業意見嗎？Do you need就是「是否需要」。Want是想要，need是需要。

2010-09-01 11:22:28 補充：
Would you like slippers?

Do you want / need a new pair of slippers?

無不可的。

Would you care for a drink?

以上是外國人常說的

你提供的選擇是香港中國人會說的.

1 and 3 are both correct.

2 is asking 你想唔想..... e.g. Would you like to have a drink ? Would you like to take a break ? 用 Would you like to.... 是比較有禮貌的發問

All of them are valid, what do you mean by "正確"?