(S (S (SBAR (WHADVP (WRB When)) (S (BASENP (PRP I)) (VP (ADVP (RB first)) (VP (VBD got) (ADVP (RB here)))))) (S (BASENP (PRP it)) (VP (MD must) (VP (VB have) (VP (ADVP (RB just)) (VBN happened)))))) (PERIOD .))