Twilight was their sky : I began .
(ROOT_0 (S_0 (ATS_3 (ATS_4 (S_1 (NP_0 (NNP_0 Twilight)) (VP_5 (VBD_1 was) (NP_3 (PRPDOLLAR_0 their) (NN_0 sky)))) (COLON_0 :)) (S_1 (NP_0 (PRP_1 I)) (VP_5 (VBD_1 began)))) (DOT_0 .)))