The project involves building treebanks from the Brown, Switchboard, ATIS, and Wall Street Journal corpora of English, as well as treebanks in Arabic and Chinese

The Penn Treebank project

A treebank is a syntactically annotated corpus that every sentence in the collection is paired with a corresponding parse tree; building a treebank involves the use of parsers and manual correction process.

University of Michigan - Ann Arbor

A parse tree is one way to represent the syntactic structure of a string according to some context-free grammar. In parsing trees, each sentence starts with the start symbol $$S$$.


Parse Tree

An on-going but a helpful book resource about NLP
https://web.stanford.edu/~jurafsky/slp3/

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