A metaphor states that one thing is something else. This description, however, is too simple for the way metaphors often work in poetry, literature and speeches. You will often find something being described, or written about, as if it is something else, without the writer ever saying 'x is y' (do you see the mathematical metaphor there?).
Some of the examples in this quiz are quite challenging to spot. Others are more obvious. Keep paying attention and you will soon see that metaphors are everywhere!