(S (S (QT (DQL '') (S (PRN (LRB [) (S (BASENP (PRP It)) (VP (MD could))) (RRB ])) (VP (VB be) (BASENP (NNS months)))) (DQR '')) (SBAR (IN before) (S (NP (BASENP (DT any)) (PP (IN of) (BASENP (DT the) (NN satellite) (NN wreckage)))) (VP (VBZ enters) (NP (BASENP (DT the) (NN earth) (POS 's)) (NN atmosphere)))))) (PERIOD .))