a hard , knees Still fell up .
(ROOT_0 (S_0 (ATS_3 (NP_1 (ATNP_0 (NP_5 (DT_0 a) (JJ_0 hard)) (COMMA_0 ,)) (NNS_0 knees)) (VP_4 (ATVP_0 (ADVP_0 (RB_0 Still)) (VBD_2 fell)) (PRT_0 (RP_0 up)))) (DOT_0 .)))