( ( On ( the water ) ) ( surface ( ( walk ( long ( legged insects ) ) ) . ) ) )
(ROOT (S (PP (IN On) (NP (DT the) (NN water))) (NP (NN surface)) (VP (VBP walk) (NP (JJ long) (JJ legged) (NNS insects))) (. .)))
On the water surface walk long legged insects.
(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)))))))) (. .)))