Each corpus token has the attribute tag in which its part of speech is specified. This tagset is used in the Oxford English Corpus. The full set of part-of-speech tags is shown in the table below; an initial dash marks closed categories (i.e. which cannot be guessed for unknown words):

AT article a, the, no, every
DT determiner some, this etc.
PP$ possessive determiner his, her, my, etc.
TO auxiliary particle to
MD modal can, will, may, should, etc.
BEP am, are
BED was, were
BEG being
BEI be
BEZ is
BEH been
DOZ auxiliary does
DOD auxiliary did
DOP auxiliary do
HVZ auxiliary has
HVP auxiliary have (finite)
HVD auxiliary had
HVG auxiliary having
HVI auxiliary have (infinitive)
AJJ attributive adjective
AJJR attributive adjective comparative
AJJS attributive adjective superlative
PJJ predicative adjective
PJJR predicative adjective comparative
PJJS predicative adjective superlative
AVBB past (passive) participle used attributively
AVBG present participle used attributively
VBP_T transitive verb present non 3rd sing
VBI_T transitive verb infinitive
VBD_T transitive verb past
VBZ_T transitive verb present 3rd sing
VBG_T transitive verb present participle
VBH_T transitive verb past participle
VBB_T transitive verb passive participle
VBP_I intransitive verb present non 3rd sing
VBI_I intransitive verb infinitive
VBD_I intransitive verb past
VBZ_I intransitive verb present 3rd sing
VBG_I intransitive verb present participle
VBH_I intransitive verb past participle
VBP_A intrans verb taking adjectival complement pres non 3rd sg
VBI_A intrans verb taking adjectival complement infinitive
VBD_A intrans verb taking adjectival complement past
VBZ_A intrans verb taking adjectival complement present 3rd sing
VBG_A intrans verb taking adjectival complement present participle
VBH_A intrans verb taking adjectival complement past participle
CC coordinating conjunction and, but, or etc.
C1 the first element of a compound coordination – both, neither, either
PREP preposition except by or of e.g. in, on, under, beside
BY by
OF of
IN than, though, etc. when not prepositions
SC subordinating conjunction, eg since, although, because
CMP the complementiser that
NNS_H plural head noun
NNS_M plural modifier noun
NPS plural proper head noun
NPS_M plural proper modifier noun
NN_H singular head noun
NN_M singular modifier noun
NP singular proper noun
NP_M singular proper modifier noun
NT noun phrase time adverbial last September, every Friday etc.
POS genitive ‘s, ‘
DP definite or indefinite pronoun some, this, anyone etc.
EX existential there
OPP objective personal or possessive pronoun me, mine, you, yours, him, his, her, hers, it, them, theirs etc
SPP subjective personal or possessive pronoun I, you, yours, he, his, she, hers, they etc.
RPP reflexive pronoun herself, himself, itself, myself, etc.
WP Wh pronoun what which who that
WP$ whose
WRB Wh adverb why where however etc.
WDT Wh determiner what, which
QP quantifier pronoun much more most few less etc.
PDT pre-determiner all, both, half, such, twice
FQ floated quantifier all, both
RB adverb modifying verb e.g. adoringly, again, ahead
RBR adverb comparative e.g. bigger, better, faster, more
RBS adverb superlative e.g. biggest, best, fastest, most
NEG not
RN else following indefinite pronoun
RP adverbial particle, e.g. across, back, out, over
RA enough, indeed following adjective
RC as following adjective and preceding standard of comparison
RD only, just preceding noun phrase
RF adverb following noun phrase here there alone east etc.
RG adverb following time or measure noun phrase ago, hence etc.
RGR comparative RG earlier, later
RI adverb modifying a following preposition or subord. conj., e.g. anywhere, even, just, partly, right
RIR comparative RI more, less
RJ adverb modifying a following adjective or adverb e.g. abjectly, coldly, so, very
RT temporal adverb then now today
RQ adverb modifying a following numeral only about almost exactly
UH interjection. e.g gosh, heavens, pooh, rats
CD1 the number one
CD numbers five, thirty-two, million, third, fifteenth etc.
CD_M number in modifier position
CDS plurals of numbers fives, millions etc.
CDS_M plural number in modifier position
LS list separator
FW foreign word
$ currency symbol
: colon, semicolon, dash
( left bracket
) right bracket
, comma
. full stop, question mark or exclamation mark