Questions & Answers about Kan De sige mig, om der også er en garage til lejligheden?
De is the formal, polite way to say you in Danish. It is often capitalized to show respect and to distinguish it from de, which normally means they.
In modern spoken Danish, du is much more common, even in many polite situations, so De can sound quite formal or old-fashioned. But you may still see it in very polite language, especially in writing or in older materials.
Danish often puts the verb first when forming a yes/no question. So:
De kan sige mig ... = You can tell me ...
becomes
Kan De sige mig ...? = Can you tell me ...?
This is similar to English question formation with auxiliary verbs.
Literally, sige mig means say to me or tell me.
In this sentence, Kan De sige mig ...? is a polite way of saying Can you tell me ...?
Danish often uses sige in places where English would more naturally use tell.