Why are you so upset?
The boss is driving me nut!
upset 作形容词重音在第二个音节，作名词时重音在第一个音节。
I'm very upset.
He had a big upset, so he is very upset.
He had a very big upset, so he is very upset.
He is driving me to town.
He is driving me there.
He is driving me crazy.
His sister was driving him nut with her constant phone calls.
His sister was driving him mad/crazy with her constant phone calls.