For how long should I walk?What can I help you with?

For how long should I walk?What can I help you with? How can I help you?与What can I do for you?的区别 句型：1.I know how you feel 2.Elephants can walk for a long tim what can i help you with? 英语翻译14.购物A.Can/May I help you?What can I do for you?How many what can i help you with?为什么要加with? If I should see you,after long yeas.How should I greet,with If I should see you,after long year,How should I greet,with If I should see you after long year.How should I greet with -How can I help you? How can I help you 和 What can I help you 的区别 how can i help you?还是what can i help you?