( ( If ( ( the tunnel ) ( can ( be ( placed ( ( forward and ) ( ( low then ) ( a ( ( good 4 ) ( horsepower unit ) ) ) ) ) ) ) ) ) ) ( ( will work ) . ) )
(ROOT (S (SBAR (IN If) (S (NP (DT the) (NN tunnel)) (VP (MD can) (VP (VB be) (VP (VBN placed) (UCP (ADVP (RB forward)) (CC and) (PP (ADVP (JJ low)) (RB then) (NP (DT a) (ADJP (JJ good) (NP (CD 4))) (NN horsepower) (NN unit))))))))) (VP (MD will) (VP (VB work))) (. .)))
If the tunnel can be placed forward and low then a good 4 horsepower unit will work.
(ROOT (S (NP (DT A) (NN horsepower)) (VP (VBZ is) (ADJP (JJ equal) (PP (TO to) (NP (NP (DT the) (NN amount)) (PP (IN of) (NP (NN work)))))) (SBAR (S (NP (DT a) (NN horse)) (VP (MD can) (VP (VB do) (PP (IN in) (NP (CD 1) (NN minute)))))))) (. .)))