she had to sit through it again 
(ROOT (S (NP (PRP she)) (VP (VBD had) (S (VP (TO to) (VP (VB sit) (PP (IN through) (NP (PRP it))) (ADVP (RB again))))))))
(ROOT (S (NP (PRP )) (VP (VBD ) (S (VP (TO ) (VP (VB ) (PP (IN ) (NP (PRP ))) (ADVP (RB ))))))))