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2. Part of speech - Wikipedia

   en.wikipedia.org/wiki/Part_of_speech

   Pronoun (antōnymíā): a part of speech substitutable for a noun and marked for a person; Preposition (próthesis): a part of speech placed before other words in composition and in syntax; Adverb (epírrhēma): a part of speech without inflection, in modification of or in addition to a verb, adjective, clause, sentence, or other adverb

3. Part-of-speech tagging - Wikipedia

   en.wikipedia.org/wiki/Part-of-speech_tagging

   Part-of-speech tagging is harder than just having a list of words and their parts of speech, because some words can represent more than one part of speech at different times, and because some parts of speech are complex. This is not rare—in natural languages (as opposed to many artificial languages), a large percentage of word-forms are ...

4. English grammar - Wikipedia

   en.wikipedia.org/wiki/English_grammar

   English parts of speech are based on Latin and Greek parts of speech. [40] Some English grammar rules were adopted from Latin, for example John Dryden is thought to have created the rule no sentences can end in a preposition because Latin cannot end sentences in prepositions.

5. Article (grammar) - Wikipedia

   en.wikipedia.org/wiki/Article_(grammar)

   For example, Sentence 1 uses the definite article and thus, expresses a request for a particular book. In contrast, Sentence 2 uses an indefinite article and thus, conveys that the speaker would be satisfied with any book. Give me the book. Give me a book. The definite article can also be used in English to indicate a specific class among other ...

6. Sequence labeling - Wikipedia

   en.wikipedia.org/wiki/Sequence_labeling

   In machine learning, sequence labeling is a type of pattern recognition task that involves the algorithmic assignment of a categorical label to each member of a sequence of observed values. A common example of a sequence labeling task is part of speech tagging , which seeks to assign a part of speech to each word in an input sentence or document.

7. Phrase structure rules - Wikipedia

   en.wikipedia.org/wiki/Phrase_structure_rules

   They are used to break down a natural language sentence into its constituent parts, also known as syntactic categories, including both lexical categories (parts of speech) and phrasal categories. A grammar that uses phrase structure rules is a type of phrase structure grammar.