Say I have the following Penn Tree:
(S (NP-SBJ the steel strike)
(VP lasted
(ADVP-TMP (ADVP much longer)
(SBAR than
(S (NP-SBJ he)
(VP anticipated
(SBAR *?*))))))
.)
What do abbrevations like VP and SBAR etc mean? Where can I find these definitions? What are these abbreviations called?
bdk
Those are the Penn Treebank tags, for example, VP means "Verb Phrase". The full list can be found here
The full list of Penn Treebank POS tags (so-called tagset) including examples can be found on https://www.sketchengine.eu/penn-treebank-tagset/
If you are interested in detail information on POS tag or POS tagging, see a brief manual for beginners on https://www.sketchengine.co.uk/pos-tags/
VP means verb phrase . these are standard abbreviation in the treebank.
来源：https://stackoverflow.com/questions/7853295/what-do-the-abbreviations-in-pos-tagging-etc-mean