0 used to offer, suggest, or ask politely -- skal
Shall I make some drinks? Skal jeg lage noen drinker?
1 used with “I” and “we” to talk about the future -- skal
We shall be away that week. Vi kommer til å være borte den uken.
2 used to give legal instructions -- skal
3 used to form future tenses of other verbs when the subject is I or we -- skal, komme til å
4 used to show the speaker’s intention -- skal nok
5 used in questions, the answer to which requires a decision -- skal