They would shifted a cows as I saw and stifled up .
(ROOT_0 (S_0 (ATS_3 (NP_1 (PRP_0 They)) (VP_4 (ATVP_1 (VP_5 (MD_0 would) (VP_1 (ATVP_0 (VBN_0 shifted) (NP_2 (DT_0 a) (NNS_1 cows))) (SBAR_0 (IN_2 as) (S_1 (NP_0 (PRP_1 I)) (VP_5 (VBD_1 saw)))))) (CC_0 and)) (VP_5 (VBD_0 stifled) (PRT_0 (RP_0 up))))) (DOT_0 .)))