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These are the tags used in the Penn Treebank.
Word level tags[edit source]
| Tag | Part of speech |
|---|---|
| CC | Coordinating conjunction |
| CD | Cardinal number |
| DT | Determiner |
| EX | Existential there |
| FW | Foreign word |
| IN | Preposition or subordinating conjunction |
| JJ | Adjective |
| JJR | Adjective (comparative) |
| JJS | Adjective (superlative) |
| LS | List item marker |
| MD | Modal |
| NN | Noun (singular or mass) |
| NNS | Noun (plural) |
| NNP | Proper noun (singular) |
| NNPS | Proper noun (plural) |
| PDT | Predeterminer |
| POS | Possessive ending |
| PRP | Personal pronoun |
| PRP$ | Possessive pronoun |
| RB | Adverb |
| RBR | Adverb (comparative) |
| RBS | Adverb (superlative) |
| RP | Particle |
| SYM | Symbol |
| TO | to |
| 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) |
| WDT | Wh-determiner |
| WP | Wh-pronoun |
| WP$ | Possessive wh-pronoun |
| WRB | Wh-adverb |
Phrase level tags[edit source]
| Tag | Part of speech |
|---|---|
| ADJP | Adjective Phrase |
| ADVP | Adverb Phrase |
| CONJP | Conjunction Phrase |
| FRAG | Fragment |
| INTJ | Interjection |
| LST | List marker |
| NAC | Not a Constituent |
| NP | Noun Phrase |
| NX | marks the head of the NP |
| PP | Prepositional Phrase |
| PRN | Parenthetical |
| PRT | Particle |
| QP | Quantifier Phrase |
| RRC | Reduced Relative Clause |
| UCP | Unlike Coordinated Phrase |
| VP | Verb Phrase |
| WHADJP | Wh-adjective Phrase |
| WHAVP | Wh-adverb Phrase |
| WHNP | Wh-noun Phrase |
| WHPP | Wh-prepositional Phrase |
| X | Unknown, uncertain, or unbracketable |
Clause level tags[edit source]
| Tag | Clause |
|---|---|
| S | Simple declarative clause |
| SBAR | Clause introduced by a (possibly empty) subordinating conjunction |
| SBARQ | Direct question introduced by a wh-word or a wh-phrase |
| SINV | Inverted declarative sentence |
| SQ | Inverted yes/no question, or main clause of a wh-question, following the wh-phrase in SBARQ |