When you don’t understand a part of what someone said, or when you don’t remember something you were told, you can use a wh-question and ask for the person to repeat what she said. For exemple, Mireia is pregnant and she tells Núria when the baby is due. After a few minutes, Núria doesn’t remember when the baby is due.
Núria: Quan m’havies dit que ha de néixer? (When did you tell me your baby is due?