( ( If ( you ( can ( engineer ( a ( ( very strong ) ( gravitational field ) ) ) ) ) ) ) ( , ( time ( also ( ( ( ( slows down ) , ) ( so ( to speak ) ) ) . ) ) ) ) )
(ROOT (S (SBAR (IN If) (S (NP (PRP you)) (VP (MD can) (VP (VB engineer) (NP (DT a) (ADJP (RB very) (JJ strong)) (JJ gravitational) (NN field)))))) (, ,) (NP (NN time)) (ADVP (RB also)) (VP (VBZ slows) (PRT (RP down)) (, ,) (ADVP (RB so) (S (VP (TO to) (VP (VB speak)))))) (. .)))
If you can engineer a very strong gravitational field, time also slows down, so to speak.
(ROOT (S (NP (JJ Strong) (JJ gravitational) (NNS fields)) (VP (VBP are) (ADJP (JJ capable) (PP (IN of) (S (VP (VBG altering) (NP (NP (DT the) (NN rate)) (PP (IN of) (NP (NN time) (NN passing))))))))) (. .)))