An English teacher may have told you at one time or another that you should never end a sentence with a preposition. This practice, with origins in the Latin roots of English, was popularized by John Dryden, the 17th-century poet and dramatist. This is the sort of English up with which I cannot put. Churchill's wit took on more than just grammar. The great British orator is often quoted on subjects ranging from war to recreational drinking.
Most great writers end sentences with prepositions.
Sometimes you need to place a preposition at the end for practical purposes or to avoid sounding comical. We have a lot to be happy about. To avoid ending with the preposition, you'd have a very stilted rewrite. We have a lot about which to be happy. Write a poem that communicates a definite location and an important moment.