Do you know what we are working for?为什么for不可以省略?

Do you know what we are working for?为什么for不可以省略? 英语.补充为什么、What do you like for lunch?为什么用For at 不可以么? What are you working for?We are working hard___ __ __（为了）imp we all know that you are working for an organization that pr What great scientists do you know?What are they known for? do you know what Beibei (stands for还是stand for) 英语翻译Leave you for a few months,I do not know what you are,No What are you looking for I do? I don't know what I can do for you 为什么用what不用that Do you know what these books are useful _________?A.to B.for Do you know what( )(do)for our school trip? Here is a bowl of noodles for you.句中的is为什么不可以是are?