Questions & Answers about Ikke vær slem.
Because this is a negative command. In everyday Norwegian, negative imperatives are very often formed as:
ikke + imperative
So you get:
- Ikke vær slem
- Ikke gjør det
- Ikke løp
You can sometimes see Vær ikke slem, but Ikke vær slem is the more natural everyday order.
Because vær is the imperative form of å være.
A few forms of å være are:
- infinitive: å være
- present: er
- past: var
- imperative: vær
So:
- du er snill = statement
- vær snill = command/request
This verb is irregular, so the imperative is not something you can guess from er alone.