we had to endure last summer , and 
(ROOT (S (NP (PRP we)) (VP (VP (VBD had) (S (VP (TO to) (VP (VB endure) (NP (JJ last) (NN summer)))))) (, ,) (CC and))))
(ROOT (S (NP (PRP )) (VP (VP (VBD ) (S (VP (TO ) (VP (VB ) (NP (JJ ) (NN )))))) (, ) (CC ))))