When there is something that surprises you and you want to ask a question about it, you can express your surprise with a partial question. For example, Nuria and Joan are talking about some acquaintances that have a big loan in the bank. Joan tells Nuria that these guys have asked for more loans. Nuria is surprised and she asks how much money they owe now.
Núria: How much money do they owe? (I quants diners deuen?)