four in teaching to big parents , they was .
(ROOT_0 (S_0 (ATS_3 (ATS_1 (ATS_2 (PP_2 (ATPP_0 (NP_4 (CD_0 four)) (IN_1 in)) (S_2 (VP_0 (VBG_0 teaching) (PP_2 (TO_0 to) (NP_3 (JJ_1 big) (NNS_0 parents)))))) (COMMA_0 ,)) (NP_0 (PRP_1 they))) (VP_3 (VBD_0 was))) (DOT_0 .)))