( ( If ( you ( must work ) ) ) ( , ( ( remember ( that ( work ( equals ( force ( times distance ) ) ) ) ) ) . ) ) )
(ROOT (S (SBAR (IN If) (S (NP (PRP you)) (VP (MD must) (VP (VB work))))) (, ,) (VP (VB remember) (SBAR (IN that) (S (NP (NN work)) (VP (VBZ equals) (NP (NN force) (NNS times) (NN distance)))))) (. .)))
If you must work, remember that work equals force times distance.
(ROOT (S (NP (NNP Force) (NNS times) (NN distance)) (VP (VBZ is) (NP (NP (DT the) (NN equation)) (PP (IN for) (NP (NN work))))) (. .)))