It is commonly used to indicate the present time or to emphasize something happening in the moment.
Here are some examples of how "hun" is used in Punjabi:
* Hun mein jaa raha haan. (Now I am going.)
* Hun mujhe bhookh lagi hai. (Now I am hungry.)
* Hun kyun na hum yeh karain? (Why don't we do this now?)
The word "hun" is pronounced with a short "u" sound, similar to the "u" in "but".