( ( ( -LRB- ( E1 -RRB- ) ) ( The student ) ) ( ( will ( compare ( ( the weight ) ( of ( ( two objects ) ( using ( a ( balance scale ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (-LRB- -LRB-) (NNP E1) (-RRB- -RRB-)) (NP (DT The) (NN student))) (VP (MD will) (VP (VB compare) (NP (NP (DT the) (NN weight)) (PP (IN of) (NP (NP (CD two) (NNS objects)) (VP (VBG using) (NP (DT a) (NN balance) (NN scale)))))))) (. .)))
(E1) The student will compare the weight of two objects using a balance scale.
(ROOT (S (NP (DT A) (NN student)) (VP (MD should) (VP (VB use) (NP (DT a) (NN balance) (S (VP (TO to) (VP (VB compare) (NP (NP (DT the) (NNS masses)) (PP (IN of) (NP (CD two) (JJ small) (NNS rocks)))))))))) (. .)))