Questions & Answers about Jeg må aflyse tiden.
Here må is the present tense of the modal verb at måtte.
In this sentence, må expresses necessity:
- I have to...
- I must...
So it is not mainly about permission here. Danish må can mean either:
- may / be allowed to
- must / have to
The context tells you which meaning is intended.
Both can sometimes be translated as must or have to, but they often feel slightly different.
Jeg må aflyse tiden
= I have to cancel the appointment
This often suggests that circumstances make it necessary.Jeg skal aflyse tiden
= I’m supposed to cancel the appointment / I’m going to cancel the appointment
This can sound more like a plan, duty, or instruction.
So må often has a feeling of necessity, while skal often has a feeling of obligation, intention, or schedule.