you want to punch the button and go
( you ( want ( to ( ( ( punch ( the button ) ) and ) go ) ) ) )
(ROOT (S (NP (PRP you)) (VP (VBP want) (S (VP (TO to) (VP (VP (VB punch) (NP (DT the) (NN button))) (CC and) (VP (VB go))))))))
You should start going before punching the button.
( You ( ( should ( start ( going ( before ( punching ( the button ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP You)) (VP (MD should) (VP (VB start) (S (VP (VBG going) (PP (IN before) (S (VP (VBG punching) (NP (DT the) (NN button))))))))) (. .)))