them asked how grass would breathe .
(ROOT_0 (S_0 (ATS_3 (NP_1 (PRP_0 them)) (VP_4 (VBD_0 asked) (SBAR_0 (WHADVP_0 (WRB_0 how)) (S_1 (NP_0 (NN_2 grass)) (VP_5 (MD_0 would) (VP_1 (VB_0 breathe))))))) (DOT_0 .)))