MacBeth looks up with a start as his name is called, his evil plotting deep thinking having been interrupted quite unexpectedly.
"I dinnae kill anybo--!!!?" ........... Crap. "I mean... tha mi sona... chan eil mi sona... tha..."
Tapering off, he decides that it might be best to look at his worksheet again and to shut up.
At this point, he really isn't certain if he's doing alright or not... But at least there isn't a ghost glaring at him balefully from across the room.
There might as well be.
Yep. The answer was definitely 'chan eil.'