( We ( also ( ( ( ( learn ( that ( ( opposite chrages ) ( attract ( each other ) ) ) ) ) , ) ( while ( ( similar charges ) ( repel ( one another ) ) ) ) ) . ) ) )
(ROOT (S (NP (PRP We)) (ADVP (RB also)) (VP (VBP learn) (SBAR (IN that) (S (NP (JJ opposite) (NNS chrages)) (VP (VBP attract) (NP (DT each) (JJ other))))) (, ,) (SBAR (IN while) (S (NP (JJ similar) (NNS charges)) (VP (VBP repel) (NP (CD one) (DT another)))))) (. .)))
We also learn that opposite chrages attract each other, while similar charges repel one another.
(ROOT (S (NP (JJ Opposite) (NNS charges)) (VP (VBP attract) (NP (CD one) (DT another))) (. .)))