It's really difficult to find examples so that you can see what structure they're assigning these things. Here's one that I didn't manage to find, although I don't know what other structures they may also be giving them.
(TOP (S (X (NP (PRP$R Her)
(NN debut))
(ADJP (RB over)))
(, ,)
(S (ADVP (RB perhaps))
(S (NP (DT the)
(JJR earlier)
(NNS scenes))
(AUX (MD will))
(VP (VB emerge)
(ADJP (ADVP (RB equally))
(JJ fine))))))
(. .))
This example came from the Brown corpus. I could find no similar examples in the WSJ corpus.