They refer was soon teaching the navy that songs .
(ROOT_0 (S_0 (ATS_3 (NP_1 (PRP_0 They)) (VP_4 (VBP_0 refer) (SBAR_0 (VP_0 (ATVP_0 (VBD_1 was) (RB_1 soon)) (VP_2 (ATVP_4 (VBG_0 teaching) (NP_5 (DT_0 the) (NN_2 navy))) (PP_2 (IN_0 that) (NP_3 (NNS_1 songs)))))))) (DOT_0 .)))