They was schoolhouse of the phrase by freezing .
(ROOT_0 (S_0 (ATS_3 (NP_1 (PRP_0 They)) (VP_4 (VBD_1 was) (ADJP_0 (JJ_1 schoolhouse) (PP_1 (IN_1 of) (NP_0 (NP_5 (DT_0 the) (NN_2 phrase)) (PP_0 (IN_1 by) (NP_2 (NN_3 freezing)))))))) (DOT_0 .)))