( ( Standard ( -LRB- ( s -RRB- ) ) ) ( ( 3.22 ( ( 11.04 Recognize ) ( ( ( ( that ( ( all objects ) ( exert ( ( attractive ( gravitational force ) ) ( on ( other objects ) ) ) ) ) ) , ) and ) ( that ( ( ( this ( mutual attraction ) ) ( between ( two masses ) ) ) ( explains ( how ( ( ( ( ( ( objects , ) ( the atmosphere ) ) , ) and ) ( the seas ) ) ( stay ( fixed ( to ( ( the surface ) ( of ( the earth ) ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNP Standard)) (PRN (-LRB- -LRB-) (PRP s) (-RRB- -RRB-))) (VP (VBZ 3.22) (NP (NP (NNP 11.04) (NNP Recognize)) (SBAR (SBAR (IN that) (S (NP (DT all) (NNS objects)) (VP (VBP exert) (NP (NP (JJ attractive) (JJ gravitational) (NN force)) (PP (IN on) (NP (JJ other) (NNS objects))))))) (, ,) (CC and) (SBAR (IN that) (S (NP (NP (DT this) (JJ mutual) (NN attraction)) (PP (IN between) (NP (CD two) (NNS masses)))) (VP (VBZ explains) (SBAR (WHADVP (WRB how)) (S (NP (NP (NNS objects)) (, ,) (NP (DT the) (NN atmosphere)) (, ,) (CC and) (NP (DT the) (NNS seas))) (VP (VBP stay) (VP (VBN fixed) (PP (TO to) (NP (NP (DT the) (NN surface)) (PP (IN of) (NP (DT the) (NN earth))))))))))))))) (. .)))
Standard(s) 3.22 11.04 Recognize that all objects exert attractive gravitational force on other objects, and that this mutual attraction between two masses explains how objects, the atmosphere, and the seas stay fixed to the surface of the earth.
(ROOT (S (NP (NP (NNS Objects)) (PP (IN on) (NP (NN earth)))) (VP (VBP have) (NP (NP (CD two) (NNS forces)) (VP (VBG acting) (PP (IN on) (NP (PRP them))) (PP (IN at) (NP (DT all) (NNS times)))))) (. .)))