( ( ( The ( most common ) ) ( reducing agents ) ) ( ( ( ( are metals ) , ) ( for ( they ( tend ( to ( ( lose ( electrons ( in ( their reactions ) ) ) ) ( with nonmetals ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (RBS most) (JJ common)) (VP (VBG reducing) (NP (NNS agents)))) (VP (VBP are) (NP (NNS metals)) (, ,) (SBAR (IN for) (S (NP (PRP they)) (VP (VBP tend) (S (VP (TO to) (VP (VB lose) (NP (NP (NNS electrons)) (PP (IN in) (NP (PRP$ their) (NNS reactions)))) (PP (IN with) (NP (NNS nonmetals)))))))))) (. .)))
The most common reducing agents are metals, for they tend to lose electrons in their reactions with nonmetals.
(ROOT (S (PP (IN In) (NP (NP (DT a) (NN comparison)) (PP (IN of) (NP (NP (NNS metals)) (PP (TO to) (NP (NNS nonmetals))))))) (, ,) (NP (NNS metals)) (VP (VBP tend) (S (VP (TO to) (VP (VB have) (NP (NP (JJR greater) (NN conductivity)) (CC and) (NP (JJR higher) (NN melting) (NNS points))) (PP (IN than) (NP (NNS nonmetals))))))) (. .)))
In a comparison of metals to nonmetals, metals tend to have greater conductivity and higher melting points than nonmetals.