I felt like a rat.
( I ( ( felt ( like ( a rat ) ) ) . ) )
(ROOT (S (NP (PRP I)) (VP (VBD felt) (PP (IN like) (NP (DT a) (NN rat)))) (. .)))
I felt great.
( I ( ( felt great ) . ) )
(ROOT (S (NP (PRP I)) (VP (VBD felt) (ADJP (JJ great))) (. .)))