"Irony and Ambiguity"

At first i thought irony was when the story ends sad , but I learned that this was wrong. Actually, irony is the difference between what the readers expect or what seems suitable and the reality of what happens. There are three different types of irony Verbal, Situational,Dramatic.
I also learned about Ambiguity. I used to think that Ambiguity was when you read a story and the ending is a surprise, but i learned Ambiguity is an element of uncertainty in a text, in which something can be interpreted in a number of different ways.On my Irony and Ambiguity pretest, I was below grade level. On my posttest I hope to earn a at grade level.