( ( One ( of ( the propellers ) ) ) ( ( was ( used ( to ( steer ( the craft ) ) ) ) ) . ) )
(ROOT (S (NP (NP (CD One)) (PP (IN of) (NP (DT the) (NNS propellers)))) (VP (VBD was) (VP (VBN used) (S (VP (TO to) (VP (VB steer) (NP (DT the) (NN craft))))))) (. .)))
One of the propellers was used to steer the craft.
(ROOT (S (NP (NN Fish)) (VP (VBP use) (NP (NP (DT some)) (PP (IN of) (NP (PRP$ their) (NNS fins) (S (VP (TO to) (VP (VB propel) (NP (PRP themselves)) (PP (IN through) (NP (NP (DT the) (NN water)) (CC and) (NP (NP (DT some)) (PP (IN of) (NP (PRP$ their) (NNS fins) (S (VP (TO to) (VP (VB steer)))))))))))))))) (. .)))