"The thousand injuries of Fortunato I had borne as I best could; but when he ventured upon insult, I vowed revenge."
"And I [drink] to your long life"
When Montressor was thinking, "The thousand injuries of Fortunato I had borne as I best could; but when he ventured upon insult, I vowed revenge.", it had an example of a hyperbole. He coudn't have thousands of injuries caused by Fortunato, he exaggerated, meaning that Fortunato had hurt him many times.
When Montressor starts building up the wall, he paints the image in your mind by saying, "Throwing them aside, I soon uncovered a quantity of building stone and mortar. With these materials and with the aid of my trowel, I began vigorously to wall up the entrance of the niche."
When Montressor says "And I [drink] to your long life." it is an example of irony because he knows that Fortunato's life is going to be cut quite short, as of tonight.
"These orders were sufficient, I well knew, to insure their immediate disappearance, one and all, as soon as my back was turned. " When Montressor and Fortunato get to Montressor's house, no one is there. Montressor told them all not to stay any longer. This is an example of tone because, the way he says it makes known that he knew he was going to kill Fortunato tonight and didn't want anyone there to witness. Setting the tone as suspenseful and mysterious.
At the carnival, Fortunato is dressed up as a clown, or a fool in some cases. This can symbolize that Fortunato gets fooled into his death later that night.
When Fortunato and Montressor were walking down the hallways, he explained it as, "We had passed through walls of piled bones, with casks and puncheons intermingling, into the inmost recesses of the catacombs." When he says this, it gives a cold and eerie feeling to the story.