请问：是问别人问题时的礼貌用语.类似的情况下,英语一般用：Excuse me, may I ask you ...? 劳驾：是请别人做某事时的客套话,类似：麻烦您做…… 类似的情况下,英语一般用：Could you ...(for example: Could you please come over here?劳驾您过来一下好吗?） 借光：是有人挡你的路了,你想让人让一下以便你过去时的礼貌用语. 类似的情况下,英语一般用：excuse me.就可以了. 请问：a polite expression used when you wanna ask someone a question. 劳驾：a polite expression used when you ask someone to do something for you. 借光：a polite expression used when someone is in your way and you want him/her to move a bit so that you can pass.
