Perguntas com preposição (De quem...?)

The Preposition Comes First

In English the preposition trails: Who do you live WITH? Portuguese fronts it — always:

Com quem vives?Who do you live with?
De quem é esta mochila?Whose backpack is this?
A quem deste o livro?Who did you give the book to?
Para quem é o bolo?Who is the cake for?
De que falas?What are you talking about?

There is no Portuguese sentence that ends ...vives com? — the preposition and its question word travel together to the front.

De quem é...? is THE ownership question, and the answer mirrors it: — De quem é esta mochila? — É da Rita.

Whose backpack is this?
De quem é esta mochila?

Asking Without Moving Anything

In speech, Portuguese can also leave the question word exactly where the answer would sit: Vives onde? (You live WHERE?), Chegas quando? It sounds natural and slightly informal — the rising intonation does the work.

You live where?
Vives onde?

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