Modal verbs are commonly used to express various degrees of certainty from near certainty to uncertainty through possibility or probability. So in English : 1 - She must be in her room 2 - She can't be in her room 3 - She should be in her room 4 - She may be in her room 5 - She could be in her room 6- She might be in her room What about Scandinavian languages ? Is it possible to make out a similar kind of scale with verbs as måste , få , skola, tör ( or others ) ? It would be also interesting to point out possible discrepancies between Swedish , Danish, Norwegian and Islandic . Thanks a lot for your explanations.