Comment
I'm going to give you these in no particular order. Also, I should note that I didn't find anything that could be called situational irony, other than the scene itself. More on this later.
Oxymoron
One of the most famous lines in Romeo and Juliet takes place right at the end of Scene Two. An oxymoron is two words that don't seem to go together and yet when spoken or written describe accurately what's going on. The line I'm referring to has Juliet saying "Parting is such sweet sorrow" How can sorrow be sweet, but in their case it is. Juliet has been working very hard at two things through out scene II. She is desperate to have Romeo declare his love because she's already done so. She also is trying to get him to leave even though she really doesn't want him to go anywhere but near her. He's in great danger being near her.
Situational Irony.
The whole scene is a situational irony. Juliet wants Romeo to stay. She also wants him to go. We know something the two of them don't, that to go or stay is disastrous for both of them.
Irony (Definition) The most basic thing about irony is that we, the audience or readers, know something that R and J don't. That's what irony is: knowledge revealed to the audience that the characters don't know. If they did know, the whole tragedy could be averted.
Verbal Irony
Another speech that takes place at the end of R and J. Romeo is left by himself after his encounter with Juliet. He says "I hope you sleep peacefully" -- it is ironic because it actually (later on) does happen. Not only that, but he wishes he were sleep so that he could be the source of her rest. If that isn't an ironic statement, I don't know what is. He will also be the cause of her sleep.
Personification
Right at the very beginning of R and J Act II Scene II Romeo has the first line. He says a little bitterly, "He jests at scars that never felt a wound."
Romeo is personifying scars saying that they can inflict pain and emotional turmoil without there being a wound.
Monologue
Juliet, having no idea that Romeo is there nearby, starts to speak. She thinks she talking to herself (and of course the audience). Just because he's there eavesdropping doesn't change the fact that she thinks she's totally alone. She pours out her heart, saying things she would never say if she had our knowledge. There's all sorts of things here. There's also dramatic irony and some foreshadow (which you are not asked for).
Analogy
This is a comparison between two things which seem far fetched, but are not when explained. Romeo is speaking in about line 17 telling us (by analogy) that her eyes are stars that shine brightly but have decided to leave the heavens on some sort of business and have asked her eyes to shine in their place. The stars don't know what they've done is the implication because her eyes would shame the stars in the same way that daylight would outshine a lamp.
Dramatic Irony
The Balcony speech again. Juliet declares her love of Romeo to the point that knowing they are enemies not through their own personal doing, she would go to the extent of renouncing her name. That will happen, but not with the results she thinks will happen. So it is a foreshadow as well.
