NLTK的词性

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NOUN n,VERB v ,ADJ a, ADV r, ADJ_SAT s
NOUN: [('s', ''), ('ses', 's'), ('ves', 'f'), ('xes', 'x'),
('zes', 'z'), ('ches', 'ch'), ('shes', 'sh'),
('men', 'man'), ('ies', 'y')],
VERB: [('s', ''), ('ies', 'y'), ('es', 'e'), ('es', ''),
('ed', 'e'), ('ed', ''), ('ing', 'e'), ('ing', '')],
ADJ: [('er', ''), ('est', ''), ('er', 'e'), ('est', 'e')],
ADV: [],
ADJ_SAT:[('er', ''), ('est', ''), ('er', 'e'), ('est', 'e')]
pos_tag(word_tokenize("John's big idea isn't all that bad.")) # doctest: +SKIP
[('John', 'NNP'), ("'s", 'POS'), ('big', 'JJ'), ('idea', 'NN'), ('is',
'VBZ'), ("n't", 'RB'), ('all', 'DT'), ('that', 'DT'), ('bad', 'JJ'),
('.', '.')]
1. CC Coordinating conjunction 连接词
2. CD Cardinal number 基数词
3. DT Determiner 限定词（如this,that,these,those,such，不定限定词：no,some,any,each,every,enough,either,neither,all,both,half,several,many,much,(a) few,(a) little,other,another.
4. EX Existential there 存在句
5. FW Foreign word 外来词
6. IN Preposition or subordinating conjunction 介词或从属连词
7. JJ Adjective 形容词或序数词
8. JJR Adjective, comparative 形容词比较级
9. JJS Adjective, superlative 形容词最高级
10. LS List item marker 列表标示
11. MD Modal 情态助动词
12. NN Noun, singular or mass 常用名词单数形式
13. NNS Noun, plural 常用名词复数形式
14. NNP Proper noun, singular 专有名词，单数形式
15. NNPS Proper noun, plural 专有名词，复数形式
16. PDT Predeterminer 前位限定词
17. POS Possessive ending 所有格结束词
18. PRP Personal pronoun 人称代词
19. PRP$ Possessive pronoun 所有格代名词
20. RB Adverb 副词
21. RBR Adverb, comparative 副词比较级
22. RBS Adverb, superlative 副词最高级
23. RP Particle 小品词
24. SYM Symbol 符号
25. TO to 作为介词或不定式格式
26. UH Interjection 感叹词
27. VB Verb, base form 动词基本形式
28. VBD Verb, past tense 动词过去式
29. VBG Verb, gerund or present participle 动名词和现在分词
30. VBN Verb, past participle 过去分词
31. VBP Verb, non-3rd person singular present 动词非第三人称单数
32. VBZ Verb, 3rd person singular present 动词第三人称单数
33. WDT Wh-determiner 限定词（如关系限定词：whose,which.疑问限定词：what,which,whose.）
34. WP Wh-pronoun 代词（who whose which）
35. WP$ Possessive wh-pronoun 所有格代词

36. WRB Wh-adverb 疑问代词（how where when）

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