How to say "sorry" in Darija

I am a bit unsure of what word to use for Sorry.
We say it a lot in England but I am not aware of it being used so much in Morocco.
For instance, a casual use might be: “Sorry,… I didn’t hear the phone”
Then what would you use for a more serious reply? : “Oh, I am sorry to hear about their illness”
And an apology for bumping into someone in a shop or train?, (we usually abbreviate it to “Sorr…”)
I’m sure this would be helpful for many non Moroccan s!

Smah liya