Overview
Conjugation is the process by which verbs change form to express who is performing an action, when it occurs, how it is viewed, or other grammatical relationships. In many languages a verb's stem remains identifiable while one or more affixes, endings, or auxiliary words encode information such as person, number, tense, mood, aspect and voice. For a basic definition, see verb.
Core features and categories
Most conjugation systems mark several common grammatical categories. These include:
- Person (first, second, third) and number (singular, plural).
- Tense (time reference such as past, present, future) and aspect (completed vs ongoing action).
- Mood (indicative, subjunctive, imperative, etc.) and voice (active, passive).
Different languages combine these in different ways. For example, the Romance languages typically attach distinct endings to a verb stem, while some languages use separate helping verbs or particles to express tense and aspect.
How conjugation works: patterns and the infinitive
Many conjugation systems are patterned: a class of verbs share the same endings and form regular paradigms. The uninflected base form is often called the infinitive. For example, in French the infinitive manger has a stem mang-; to form present tense persons one removes the -er and attaches endings appropriate to the subject. English uses the infinitive in constructions such as "I like to eat," and in auxiliary combinations: see also English verb patterns.
History and development
Conjugation patterns arise from the historical evolution of languages. Older synthetic forms (single-word inflections) often develop into analytical forms (multi-word constructions) over time. Sound changes, analogy and grammaticalization can create regular classes or produce irregular verbs that preserve older forms. Language contact and internal change continually reshape how verbs are conjugated.
Examples and cross-linguistic contrasts
Languages differ widely in how they mark verb information. Romance and Slavic languages typically use rich inflectional endings; English has modest inflection and relies heavily on auxiliary verbs; many Turkic and Finno-Ugric languages use agglutinative suffix chains; some isolating languages use particles rather than inflection. The general pattern in a language may be regular, but there will usually be exceptions: irregular verbs, suppletive forms, or stem alternations. See a discussion of pattern types here and notes on other families here.
Practical importance and learning tips
Conjugation is central to fluency: correct verb forms allow speakers to convey who did what and when. For learners, common advice is to start with high-frequency verbs and regular paradigms, learn personal endings once, and practice irregular verbs separately. Understanding the underlying categories — person, number, tense, mood, aspect, voice — helps when comparing languages or analyzing unfamiliar conjugation patterns.
Further reading and resources can expand on paradigms, irregular verb lists, and specific language treatments; introductory grammar guides often present paradigms for a few tenses and persons to illustrate typical patterns.