Thank you for your generosity.
( ( ( Thank you ) ( for ( your generosity ) ) ) . )
(ROOT (S (VP (VB Thank) (NP (PRP you)) (PP (IN for) (NP (PRP$ your) (NN generosity)))) (. .)))
Thanks for nothing!
( ( Thanks ( for nothing ) ) ! )
(ROOT (NP (NP (NNS Thanks)) (PP (IN for) (NP (NN nothing))) (. !)))