They is all tree knew unmistakably ballet .
(ROOT_0 (S_0 (ATS_3 (NP_1 (PRP_0 They)) (VP_4 (VBZ_0 is) (S_1 (NP_1 (DT_1 all) (NN_2 tree)) (VP_5 (VBD_0 knew) (ADJP_0 (RB_0 unmistakably) (JJ_0 ballet)))))) (DOT_0 .)))