( Work ( ( is ( ( done ( by ( the ( electric field ) ) ) ) ( if ( ( ( the ( electric force ) ) ( acting ( on ( the charge ) ) ) ) ( causes ( it ( to ( ( move ( from ( one point ) ) ) ( to another ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Work)) (VP (VBZ is) (VP (VBN done) (PP (IN by) (NP (DT the) (JJ electric) (NN field))) (SBAR (IN if) (S (NP (NP (DT the) (JJ electric) (NN force)) (VP (VBG acting) (PP (IN on) (NP (DT the) (NN charge))))) (VP (VBZ causes) (S (NP (PRP it)) (VP (TO to) (VP (VB move) (PP (IN from) (NP (CD one) (NN point))) (PP (TO to) (NP (DT another))))))))))) (. .)))
Work is done by the electric field if the electric force acting on the charge causes it to move from one point to another.
(ROOT (S (NP (NNP Work)) (VP (VBZ is) (SBAR (WHNP (WP what)) (S (NP (PRP it)) (VP (VBZ is) (VP (VBN called) (SBAR (WHADVP (WRB when)) (S (NP (DT a) (NN charge)) (VP (VBZ moves) (PP (IN against) (NP (DT a) (NN field))))))))))) (. .)))