Penn Treebank

The Penn Treebank Project is the first large-scale treebank dataset annotates phrase structure for natural language.

Example

For example, the sentence "John loves Mary" will be labelled like the following:

(S (NP (NNP John))
   (VP (VPZ loves)
       (NP (NNP Mary)))
   (. .))

POS tags

format

Corpora

Annotated corpus include:

• Wall Street Journal;
• The Brown Corpus;
• Switchboard;
• ATIS