( ( In ( a ( nonpolar ( covalent bond ) ) ) ) ( , ( atoms ( ( ( share electrons ) equally ) . ) ) ) )
(ROOT (S (PP (IN In) (NP (DT a) (NN nonpolar) (NN covalent) (NN bond))) (, ,) (NP (NNS atoms)) (VP (VBP share) (NP (NNS electrons)) (ADVP (RB equally))) (. .)))
In a nonpolar covalent bond , atoms share electrons equally.
(ROOT (S (SBAR (WHADVP (WRB When)) (S (NP (NNS electrons)) (VP (VBP are) (VP (VBN shared) (ADVP (RB equally)))))) (, ,) (NP (PRP it)) (VP (VBZ is) (VP (VBN called) (NP (NN nonpolar) (NNS bonds)))) (. .)))