If they know with his thunder bloodied back , <apostrophe><apostrophe>
(ROOT_0 (S_0 (ATS_2 (SBAR_0 (IN_2 If) (S_1 (NP_0 (PRP_1 they)) (VP_5 (ATVP_4 (VB_0 know) (PP_1 (IN_1 with) (NP_2 (ATNP_0 (PRPDOLLAR_0 his) (NN_1 thunder)) (NP_4 (NNS_1 bloodied))))) (ADVP_0 (RB_0 back))))) (COMMA_0 ,)) (APOSTROPHE_0 <apostrophe><apostrophe>)))