请问,I don't know about this, can you answer me,bla bla bla.Following "请问" a question.
劳驾,1.can you help me?when you need help,you can use this. 2.there are many people,you say "劳驾" ,let others know you want to pass them,or let others not in your way.
借过一下,you are in my way, may you give way to me.
例如:
请问去天安门怎么走。请问,接下来该怎么做呢。
劳驾,劳驾,地铁门快关了。
借过一下,我太胖了,过不去了。