he <apostrophe>s than the car refer to clouds .
(ROOT_0 (S_0 (ATS_3 (NP_0 (PRP_1 he)) (VP_2 (VBZ_0 <apostrophe>s) (SBAR_0 (IN_2 than) (S_1 (NP_0 (DT_0 the) (NN_2 car)) (VP_5 (VBP_0 refer) (PP_2 (TO_0 to) (NP_3 (NNS_1 clouds)))))))) (DOT_0 .)))