( ( For example ) ( , ( ( water striders ) ( ( use ( ( surface tension ) ( to ( walk ( on ( ( the surface ) ( of ( a pond ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN For) (NP (NN example))) (, ,) (NP (NN water) (NNS striders)) (VP (VBP use) (S (NP (NN surface) (NN tension)) (VP (TO to) (VP (VB walk) (PP (IN on) (NP (NP (DT the) (NN surface)) (PP (IN of) (NP (DT a) (NN pond))))))))) (. .)))
For example, water striders use surface tension to walk on the surface of a pond.
(ROOT (S (NP (JJ Surface) (NN tension)) (VP (VBZ is) (ADJP (JJ responsible) (PP (IN for) (NP (DT the) (NN fact)))) (SBAR (IN that) (S (NP (JJ small) (NNS insects)) (VP (MD can) (VP (VB walk) (PP (IN on) (NP (NN water)))))))) (. .)))