they that to shifted They heard in the back yawn .
(ROOT_0 (S_0 (ATS_3 (NP_1 (NP_0 (PRP_1 they)) (SBAR_0 (WHNP_0 (WDT_0 that)) (S_2 (VP_0 (TO_0 to) (VP_1 (VBN_0 shifted) (NP_1 (PRP_0 They))))))) (VP_4 (VBD_2 heard) (PP_0 (IN_1 in) (NP_6 (ATNP_1 (DT_0 the) (JJ_1 back)) (NN_1 yawn))))) (DOT_0 .)))