They is his knees thought now out sure of .
(ROOT_0 (S_0 (ATS_3 (NP_1 (PRP_0 They)) (VP_4 (VBZ_0 is) (S_1 (NP_0 (PRPDOLLAR_0 his) (NNS_0 knees)) (VP_5 (VBD_0 thought) (ADJP_0 (ATADJP_0 (ATADJP_0 (RB_0 now) (RB_1 out)) (JJ_0 sure)) (PP_1 (IN_1 of))))))) (DOT_0 .)))