There is a rule in English that you shouldn’t end a sentence with a preposition. For example, “What did you do that for?” is incorrect, because ‘for’ shouldn’t come at the end of a sentence. Here’s a little story that amusingly (if you’re a sad, lonely grammarian) comments on the rule:
A family is planning a move to Australia, a prospect which the young son does not relish. His parents have been telling him all about the country to try to get him excited about the idea, but without success. One evening the father sends his son upstairs to bed, and comes up a moment later with a book about Australia. The irate child sees it and says “What did you bring that book I didn’t want to be read to out of about Down Under up for?”
Winston Churchill is said to have commented on this rule with something like:
“This is the sort of bloody nonsense up with which I will not put.”