( ( ( Mercury and ) Venus ) ( ( are ( ( the ( only ( two ( inferior planets ) ) ) ) ( in ( our ( Solar System ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Mercury) (CC and) (NNP Venus)) (VP (VBP are) (NP (NP (DT the) (JJ only) (CD two) (JJ inferior) (NNS planets)) (PP (IN in) (NP (PRP$ our) (NNP Solar) (NNP System))))) (. .)))
Mercury and Venus are the only two inferior planets in our Solar System.
(ROOT (S (NP (NNP Mercury)) (VP (VBZ is) (NP (NP (DT the) (JJS smallest) (NN planet)) (PP (IN in) (NP (PRP$ our) (JJ solar) (NN system))))) (. .)))