( ( A ( guitar string ) ) ( ( is ( tuned ( in ( frequency ( by ( ( adjusting ( the tension ) ) ( on ( ( the string ) ( with ( the ( tuning peg ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT A) (NN guitar) (NN string)) (VP (VBZ is) (ADJP (VBN tuned) (PP (IN in) (NP (NP (NN frequency)) (PP (IN by) (S (VP (VBG adjusting) (NP (DT the) (NN tension)) (PP (IN on) (NP (NP (DT the) (NN string)) (PP (IN with) (NP (DT the) (JJ tuning) (NN peg)))))))))))) (. .)))
A guitar string is tuned in frequency by adjusting the tension on the string with the tuning peg.
(ROOT (S (NP (JJ Stringed) (NNS instruments)) (VP (MD can) (VP (VB help) (VP (VB show) (NP (NP (DT the) (NN relationship)) (PP (IN between) (NP (NN tension) (CC and) (NNS frequencies)))) (PP (IN in) (NP (NNS strings)))))) (. .)))