They can moved over He to be back .
(ROOT_0 (S_0 (ATS_3 (NP_1 (PRP_0 They)) (VP_4 (MD_0 can) (VP_1 (ATVP_3 (VBD_2 moved) (PRT_0 (RP_0 over))) (S_2 (NP_1 (PRP_0 He)) (VP_0 (TO_0 to) (VP_1 (VB_0 be) (PRT_0 (RP_0 back)))))))) (DOT_0 .)))