( Many ( ( ( might quickly ) ( suggest ( that ( they ( have ( ( used ( a ( charged insulator ) ) ) ( to ( ( charge ( ( a ( neutral electroscope ) ) ( -LRB- ( or ( ( some ( other object ) ) -RRB- ) ) ) ) ) ( by contact ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT Many)) (VP (MD might) (ADVP (RB quickly)) (VP (VB suggest) (SBAR (IN that) (S (NP (PRP they)) (VP (VBP have) (VP (VBN used) (NP (DT a) (JJ charged) (NN insulator)) (S (VP (TO to) (VP (VB charge) (NP (NP (DT a) (ADJP (JJ neutral)) (NN electroscope)) (PRN (-LRB- -LRB-) (CC or) (NP (NP (DT some)) (NP (JJ other) (NN object))) (-RRB- -RRB-))) (PP (IN by) (NP (NN contact)))))))))))) (. .)))
Many might quickly suggest that they have used a charged insulator to charge a neutral electroscope (or some other object) by contact.
(ROOT (S (NP (DT A) (PRN (-LRB- -LRB-) (NP (NN n)) (-RRB- -RRB-)) (NN electroscope)) (VP (VBZ is) (VP (VBN used) (S (VP (TO to) (VP (VB study) (NP (NN charge))))))) (. .)))