stones should much forced up by the hat .
(ROOT_0 (S_0 (ATS_3 (NP_1 (NNS_0 stones)) (VP_4 (ATVP_1 (MD_0 should) (ADVP_0 (RB_0 much))) (VP_1 (ATVP_3 (VBD_2 forced) (PRT_0 (RP_0 up))) (PP_0 (IN_0 by) (NP_5 (DT_0 the) (NN_2 hat)))))) (DOT_0 .)))