preposition at end of sentence
Whether the preposition may come last.
A preposition may end a sentence: the hall she waited in. Moving the preposition forward is also standard: the hall in which she waited. That order sometimes makes a sentence stiff. Choose the clearer version.
Examples
UseThat is the desk she stood at.
UseThat is the desk at which she stood.
UseWhere are you from?
AvoidFrom where are you?