able to pull it back on course 
(ROOT (ADJP (JJ able) (S (VP (TO to) (VP (VB pull) (NP (PRP it)) (ADVP (RB back) (PP (IN on) (NP (NN course)))))))))
(ROOT (ADJP (JJ ) (S (VP (TO ) (VP (VB ) (NP (PRP )) (ADVP (RB ) (PP (IN ) (NP (NN )))))))))