(QT (DQL ``) (QTC (S (BASENP (NNP People)) (VP (VBP know) (SBAR (S (SBAR (WHADVP (WRB when)) (S (BASENP (PRP they)) (VP (VP (VBP enter) (BASENP (DT the) (NN water))) (ADVP (RB there))))) (S (BASENP (PRP they)) (VP (VBP 're) (VP (VBG stepping) (PP (IN into) (BASENP (DT a) (NN shark) (NN habitat)))))))))) (PERIOD .)) (DQR ''))