第1个回答 2012-11-22
Can I help you? What can I do for you?Need help?
第2个回答 2012-11-22
Can I help you?
What can I do for you?
Can I do you a favor?
参考资料:自己想到的
第3个回答 2012-11-22
May I help you?
Do you need help?
第4个回答 2012-11-22
May I help you ?
What can I do for you ?