( ( ( ( ( ( Our view ) ( from Earth ) ) ( ( ( We ( 're ( in ( constant motion ) ) ) ) : ) ( ( the Earth ) ( ( rotates ( on ( its axis ) ) ) ( once ( a day ) ) ) ) ) ) , ) ( ( the Earth ) ( ( revolves ( around ( the Sun ) ) ) ( once ( a year ) ) ) ) ) . )
(ROOT (NP (NP (NP (PRP$ Our) (NN view)) (PP (IN from) (NP (NNP Earth)))) (S (S (NP (PRP We)) (VP (VBP 're) (PP (IN in) (NP (JJ constant) (NN motion))))) (: :) (S (NP (DT the) (NN Earth)) (VP (VBZ rotates) (PP (IN on) (NP (PRP$ its) (NNS axis))) (NP (RB once) (DT a) (NN day))))) (, ,) (S (NP (DT the) (NN Earth)) (VP (VBZ revolves) (PP (IN around) (NP (DT the) (NNP Sun))) (NP (RB once) (DT a) (NN year)))) (. .)))
Our view from Earth We're in constant motion: the Earth rotates on its axis once a day, the Earth revolves around the Sun once a year.
(ROOT (S (NP (NNP Earth)) (VP (VBZ rotates) (PP (PP (IN on) (NP (PRP$ its) (NNS axis)) (ADVP (RB once))) (CC times) (PP (IN in) (NP (CD one) (NN day))))) (. .)))