This is an example of verbal irony because while Montressor seems happy to see Fortunato, he really isn't and wishes he didn't see him.
"I shall not die of a cough!"
This is an example of situational irony because Montressor knew that his servant would actually leave.
I will avenge myself! How dare that stupid drunkard insult me!
The whole story is an example of dramatic irony! As the readers of the story, we know that Fortunato is going to die as as soon as he gets to the home of Montressor.The irony of it is the fact that Fortunato doesn't have a clue!
Hurry! We must leave before he arrives back home!
Fortunato may not die of a cough, but Montressor knows what's going to kill him.
In the beginning of the story Montressor literally says, 'I would be avenged." He knows that he must get back at Fortunato.
Montressor said his servants"absconded"meaning they left to avoid a situation. Did they suspect something from Montressor?