This is an example of foreshadowing because it shows what Montresor plans to do. This foreshadows his murder of Fortunato.
My dear Fortunato, you are luckily met
This shows foreshadowing by letting the reader infrence that Montresor knows how he will die, suggesting murder.
Stay in the home!
This is an example of foreshadowing because at the begining of the story we were told Fortunato insulted Montresor which relates to Montresor's coat of arms motto, showing that Montresor will punish Fortunato.
How long have you had that cough?
This shows verbal irony because when Montresor says this, Fortunato is to believe he is very lucky to have run into Montresor but in reality it is not lucky because he will be killed.
When Montresor tells his servants to stay in the home readers assume they will stay but the do they opposite. This displays situational irony
An example of dramatic irony is Montresor repeatedly being concerned for Fortunato's health. This shows irony because Montresor cares about hs cough while plotting to murder him.