They refer who to going over the freezing sun with a boy .
(ROOT_0 (S_0 (ATS_3 (NP_1 (PRP_0 They)) (VP_4 (VBP_0 refer) (SBAR_0 (WHNP_0 (WP_0 who)) (S_2 (VP_0 (TO_0 to) (VP_1 (ATVP_0 (VBG_0 going) (PRT_0 (RP_0 over))) (NP_3 (NP_6 (ATNP_1 (DT_0 the) (NN_3 freezing)) (NN_1 sun)) (PP_0 (IN_1 with) (NP_5 (DT_0 a) (NN_2 boy)))))))))) (DOT_0 .)))