Answers:
RB到它们的含义，例如adverb。（这是一个示例；或者参见@Suzana的答案，该答案链接了Penn Treebank标签集）。但您说对了，内建nltk.help.upenn_tagset('RB')函数很有帮助，并且在nltk书中早先提到过，
为了节省一些时间，这是我从一个小型语料库中提取的列表。我不知道它是否完整，但是它应该具有upenn_tagset中的大多数（如果不是全部）帮助定义...
CC：结合，协调
& 'n and both but either et for less minus neither nor or plus so
therefore times v. versus vs. whether yetCD：数字，基数
mid-1890 nine-thirty forty-two one-tenth ten million 0.5 one forty-
seven 1987 twenty '79 zero two 78-degrees eighty-four IX '60s .025
fifteen 271,124 dozen quintillion DM2,000 ...DT：确定者
all an another any both del each either every half la many much nary
neither no some such that the them these this thoseEX：存在存在
thereIN：介词或连词，从属
astride among uppon whether out inside pro despite on by throughout
below within for towards near behind atop around if like until below
next into if beside ...JJ：形容词或数字，序数
third ill-mannered pre-war regrettable oiled calamitous first separable
ectoplasmic battery-powered participatory fourth still-to-be-named
multilingual multi-disciplinary ...JJR：形容词，比较
bleaker braver breezier briefer brighter brisker broader bumper busier
calmer cheaper choosier cleaner clearer closer colder commoner costlier
cozier creamier crunchier cuter ...JJS：形容词，最高级
calmest cheapest choicest classiest cleanest clearest closest commonest
corniest costliest crassest creepiest crudest cutest darkest deadliest
dearest deepest densest dinkiest ...LS：列表项标记
A A. B B. C C. D E F First G H I J K One SP-44001 SP-44002 SP-44005
SP-44007 Second Third Three Two * a b c d first five four one six three
twoMD：模态辅助
can cannot could couldn't dare may might must need ought shall should
shouldn't will wouldNN：名词，普通，单数或质量
common-carrier cabbage knuckle-duster Casino afghan shed thermostat
investment slide humour falloff slick wind hyena override subhumanity
machinist ...NNP：名词，专有名词，单数
Motown Venneboerger Czestochwa Ranzer Conchita Trumplane Christos
Oceanside Escobar Kreisler Sawyer Cougar Yvette Ervin ODI Darryl CTCA
Shannon A.K.C. Meltex Liverpool ...NNS：名词，常见，复数
undergraduates scotches bric-a-brac products bodyguards facets coasts
divestitures storehouses designs clubs fragrances averages
subjectivists apprehensions muses factory-jobs ...PDT：预定项
all both half many quite such sure thisPOS：遗传标记
' 'sPRP：代词，个人
hers herself him himself hisself it itself me myself one oneself ours
ourselves ownself self she thee theirs them themselves they thou thy usPRP $：代词，所有格
her his mine my our ours their thy yourRB：副词
occasionally unabatingly maddeningly adventurously professedly
stirringly prominently technologically magisterially predominately
swiftly fiscally pitilessly ...RBR：副词，比较
further gloomier grander graver greater grimmer harder harsher
healthier heavier higher however larger later leaner lengthier less-
perfectly lesser lonelier longer louder lower more ...RBS：副词，最高级
best biggest bluntest earliest farthest first furthest hardest
heartiest highest largest least less most nearest second tightest worstRP：颗粒
aboard about across along apart around aside at away back before behind
by crop down ever fast for forth from go high i.e. in into just later
low more off on open out over per pie raising start teeth that through
under unto up up-pp upon whole with youTO：“ to”作为介词或不定式标记
toUH：感叹词
Goodbye Goody Gosh Wow Jeepers Jee-sus Hubba Hey Kee-reist Oops amen
huh howdy uh dammit whammo shucks heck anyways whodunnit honey golly
man baby diddle hush sonuvabitch ...VB：动词，基本形式
ask assemble assess assign assume atone attention avoid bake balkanize
bank begin behold believe bend benefit bevel beware bless boil bomb
boost brace break bring broil brush build ...VBD：动词，过去时
dipped pleaded swiped regummed soaked tidied convened halted registered
cushioned exacted snubbed strode aimed adopted belied figgered
speculated wore appreciated contemplated ...VBG：动词，现在分词或动名词
telegraphing stirring focusing angering judging stalling lactating
hankerin' alleging veering capping approaching traveling besieging
encrypting interrupting erasing wincing ...VBN：动词，过去分词
multihulled dilapidated aerosolized chaired languished panelized used
experimented flourished imitated reunifed factored condensed sheared
unsettled primed dubbed desired ...VBP：动词，现在时，不是第三人称单数
predominate wrap resort sue twist spill cure lengthen brush terminate
appear tend stray glisten obtain comprise detest tease attract
emphasize mold postpone sever return wag ...VBZ：动词，现在时，第三人称单数
bases reconstructs marks mixes displeases seals carps weaves snatches
slumps stretches authorizes smolders pictures emerges stockpiles
seduces fizzes uses bolsters slaps speaks pleads ...WDT：WH决定因素
that what whatever which whicheverWP：WH代词
that what whatever whatsoever which who whom whosoeverWRB：Wh-副词
how however whence whenever where whereby whereever wherein whereof why标签集取决于用于训练标签手的语料库。的默认标记器nltk.pos_tag()使用Penn树库标记集。
在NLTK 2中，可以检查哪个标记器是默认标记器，如下所示：
import nltk
nltk.tag._POS_TAGGER
>>> 'taggers/maxent_treebank_pos_tagger/english.pickle'这意味着它是在树库语料库上训练的最大熵标记器。
nltk.tag._POS_TAGGERNLTK 3中已不存在这种标记，但是文档指出，现成的标记器仍使用Penn Treebank标签集。
nltk.tag._POS_TAGGER不执行，也没有提供有关导入内容的特定说明。此外，找出正在使用的恶搞是一半的答案，目前的问题是要求得到恶搞内的所有可能的标签的列表
以下内容对于访问以缩写键键入的字典非常有用：
>>> from nltk.data import load
>>> tagdict = load('help/tagsets/upenn_tagset.pickle')
>>> tagdict['NN'][0]
'noun, common, singular or mass'
>>> tagdict.keys()
['PRP$', 'VBG', 'VBD', '``', 'VBN', ',', "''", 'VBP', 'WDT', ...该参考可在官方网站上找到
从那里复制和粘贴：
您可以在此处下载列表：ftp : //ftp.cis.upenn.edu/pub/treebank/doc/tagguide.ps.gz。它包括令人困惑的词性，大写和其他约定。同样，维基百科有一个与此类似的有趣部分。部分：使用的词性标签。
['LS', 'TO', 'VBN', "''", 'WP', 'UH', 'VBG', 'JJ', 'VBZ', '--', 'VBP', 'NN', 'DT', 'PRP', ':', 'WP$', 'NNPS', 'PRP$', 'WDT', '(', ')', '.', ',', '``', '$', 'RB', 'RBR', 'RBS', 'VBD', 'IN', 'FW', 'RP', 'JJR', 'JJS', 'PDT', 'MD', 'VB', 'WRB', 'NNP', 'EX', 'NNS', 'SYM', 'CC', 'CD', 'POS']基于Doug Shore的方法，但使其更易于复制粘贴
只需逐字运行即可。
import nltk
nltk.download('tagsets')
nltk.help.upenn_tagset()nltk.tag._POS_TAGGER将无法正常工作。它将给出AttributeError：模块'nltk.tag'没有属性'_POS_TAGGER'。NLTK 3中不再提供该功能。