Parts-of-speech matching and transformation

WGrammar can recognize words according to the following parts-of-speech categories:

Adjectives
Adverbs
Conjunctions
Singular and plural nouns
Prepositions
Pronouns in nominative, objective, and possessive case
Verbs in each point of view (first, second, and third person), number (singular and plural), and tense (present, past, past-perfect, and present participle), plus auxiliary verbs

WGrammar comes with a database of over 78,000 words tagged by parts of speech.

WGrammar can also perform the following transformations:

Transform singular nouns to plural, and vice versa (e.g., transform singular car to plural cars or plural radii to singular radius).
Transform pronouns from one case to another (e.g., transform objective case him to nominative case he).
Transform verbs to other points of view, numbers, and tenses (e.g., transform first-person singular steal to perfect-tense stolen, or past-tense rang to third-person singular rings).

For more information on WGrammar's parts-of-speech matching capabilities, see Pattern Matching in WGrammar.