Table A:
List of POS categories and mapping between the Google POS tag set and the Penn Treebank tag set. MD, VBD, VBP, and VBZ in the Penn Treebank tags were used to calculate the number of tense-inflected verbs.
| Google POS | Penn Treebank | Gloss |
|---|---|---|
| NOUN | NN | noun, singular or mass |
| NNS | noun, plural | |
| VERB | MD | verb, modal auxiliary |
| VB | verb, base form | |
| VBD | verb, past tense | |
| VBG | verb, gerund or present participle | |
| VBN | verb, past participle | |
| VBP | verb, non-3rd person singular present | |
| VBZ | verb, 3rd person singular present | |
| ADJ (adjective) | AFX | affix |
| JJ | adjective | |
| JJR | adjective, comparative | |
| JJS | adjective, superlative | |
| PRP$ | pronoun, possessive | |
| WDT | wh-determiner (e.g., which cookie) | |
| WP$ | wh-pronoun, possessive (e.g., whose cookie) | |
| ADV (adverb) | EX | existental there |
| RB | adverb | |
| RBR | adverb, comparative | |
| RBS | adverb, superlative | |
| WRB | wh-adverb (e.g., where) | |
| PRON | PRP | pronoun |
| ADP | IN | preposition |
| X | XX | unknown |
| INTJ | UH | interjection, exclamation |
| DET | DT | determiner |
| CONJ | CC | conjunction |