, you 'd better have a good alternative 
(ROOT (S (, ,) (NP (PRP you)) (VP (MD 'd) (ADVP (RBR better)) (VP (VB have) (NP (DT a) (JJ good) (NN alternative))))))
(ROOT (S (, ) (NP (PRP )) (VP (MD ) (ADVP (RBR )) (VP (VB ) (NP (DT ) (JJ ) (NN ))))))