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(ROOT_0 (S_0 (ATS_3 (NP_1 (PRP_0 They)) (VP_4 (MD_0 should) (VP_1 (VBN_0 assigned) (SBAR_0 (S_1 (NP_0 (DT_1 The) (NN_2 ditch)) (VP_5 (ATVP_3 (ATVP_2 (VBD_1 began) (S_2 (VP_0 (TO_0 to) (VP_1 (ATVP_4 (VBZ_0 is) (NP_2 (NN_3 something))) (S_2 (VP_0 (VBD_0 crisped) (PP_1 (IN_1 of)))))))) (COMMA_0 ,)) (PP_0 (IN_1 at) (NP_2 (ATNP_2 (NP_6 (ATNP_1 (DT_0 these) (ADJP_0 (JJ_0 able))) (NN_1 path)) (COMMA_0 ,)) (NNS_1 classes))))))))) (DOT_0 .)))