us to laugh because he acts so goofy all the time 
(ROOT (S (NP (PRP us)) (S (VP (TO to) (VP (VB laugh)))) (SBAR (IN because) (S (NP (PRP he)) (VP (VBZ acts) (ADJP (RB so) (JJ goofy)) (NP (PDT all) (DT the) (NN time)))))))
(ROOT (S (NP (PRP )) (S (VP (TO ) (VP (VB )))) (SBAR (IN ) (S (NP (PRP )) (VP (VBZ ) (ADJP (RB ) (JJ )) (NP (PDT ) (DT ) (NN )))))))