you will likely prefer to keep on watching . 
(ROOT (S (NP (PRP you)) (VP (MD will) (ADVP (RB likely)) (VP (VB prefer) (S (VP (TO to) (VP (VB keep) (PRT (IN on)) (S (VP (VBG watching)))))))) (. .)))
(ROOT (S (NP (PRP )) (VP (MD ) (ADVP (RB )) (VP (VB ) (S (VP (TO ) (VP (VB ) (PRT (IN )) (S (VP (VBG )))))))) (. )))