have to check your brain at the door 
(ROOT (S (VP (VB have) (S (VP (TO to) (VP (VB check) (NP (PRP$ your) (NN brain)) (PP (IN at) (NP (DT the) (NN door)))))))))
(ROOT (S (VP (VB ) (S (VP (TO ) (VP (VB ) (NP (PRP$ ) (NN )) (PP (IN ) (NP (DT ) (NN )))))))))