We won't let her see the tape.
( We ( ( ( wo n't ) ( let ( her ( see ( the tape ) ) ) ) ) . ) )
(ROOT (S (NP (PRP We)) (VP (MD wo) (RB n't) (VP (VB let) (S (NP (PRP her)) (VP (VB see) (NP (DT the) (NN tape)))))) (. .)))
We let her see the tape.
( We ( ( let ( her ( see ( the tape ) ) ) ) . ) )
(ROOT (S (NP (PRP We)) (VP (VBD let) (SBAR (S (NP (PRP her)) (VP (VBP see) (NP (DT the) (NN tape)))))) (. .)))