( ( In fact ) ( , ( ( a negatively ) ( ( charged ( ( plastic ( golf tube ) ) ( can ( used ( to ( charge ( an electroscope ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN In) (NP (NN fact))) (, ,) (NP (DT a) (NN negatively)) (VP (VBD charged) (SBAR (S (NP (JJ plastic) (NN golf) (NN tube)) (VP (MD can) (VP (VBN used) (S (VP (TO to) (VP (VB charge) (NP (DT an) (NN electroscope)))))))))) (. .)))
In fact, a negatively charged plastic golf tube can used to charge an electroscope.
(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))))))) (. .)))