Du må vedlegge kvitteringen.

You must attach the receipt.

Breakdown of Du må vedlegge kvitteringen.

• du: you
• må: must
• kvitteringen: the receipt
• vedlegge: to enclose; attach

Questions & Answers about Du må vedlegge kvitteringen.

Why is it må vedlegge and not må å vedlegge?

Because after a modal verb in Norwegian, the next verb normally stays in the infinitive without å.

So:

• Du må vedlegge kvitteringen. = You must attach the receipt.
• not Du må å vedlegge ...

This is similar to English:

• You must attach ...
• not You must to attach ...

Other common modal verbs that work the same way:

• kan = can
• skal = shall / will / is supposed to
• vil = want to / will
• bør = should
• må = must / have to

Examples:

• Du kan sende den.
• Jeg skal betale.
• Vi bør vente.

What exactly does må mean here?

Må means must or have to. It expresses necessity or obligation.

So Du må vedlegge kvitteringen means that attaching the receipt is required, not just optional.

Compare:

• Du må vedlegge kvitteringen. = You must / have to attach the receipt.
• Du bør vedlegge kvitteringen. = You should attach the receipt.
• Du kan vedlegge kvitteringen. = You can attach the receipt.

So må is stronger than bør and kan.

Why is it kvitteringen and not just kvittering?