COSYtools 🔎 / Reference Hub
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Language Reference & Practice Tools

Conjugation engines, gender checkers, case systems, and more across 14 languages.

Language:
✨ Core Reference Tools
📜 Detailed Language Reference Applications
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English Irregular Verbs Engine

Base, Past Simple & Past Participle

Master 200+ English irregular verbs across 5 pedagogical pattern groups with flashcards, fill-the-blank drills, and SRS dashboard.

▶ Launch EN Irregular Verbs
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Conjugueur Français

French Verb Engine

Instant conjugation of 200+ essential French verbs across all tenses with color-coded stem & ending rules.

▶ Launch FR Conjugeur
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Coniugatore Italiano

Italian Verb Engine

Full Italian verb conjugation tables, definitions, antonyms, irregular verb ending highlights, and practice trainer.

▶ Launch IT Coniugatore
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Спряжение Глаголов

Russian Verb Engine

Russian verb conjugation engine featuring aspectual pairs (НСВ/СВ) and accurate stress accent marks.

▶ Launch RU Спряжение
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Κλίση Ρημάτων

Greek Verb Engine

Modern Greek verb conjugation across active & passive voices, contracted verb classes (-άω/-ώ), and stress accents.

▶ Launch EL Κλίση
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Genre des Noms Français

French Gender & Plurals Engine

Noun gender lookup, definite/indefinite articles, ending reliability rules, and plural exceptions.

▶ Launch FR Genre
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Régime Prépositionnel Français

French Prepositional Regimes

Master dependent prepositions (à, de, pour) after French verbs, adjectives, and nouns with SRS flashcards.

▶ Launch FR Régime
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Род и Падежи Существительных

Russian Gender & 6-Case Declension

Complete Russian noun declension matrices across all 6 cases with gender rules, endings, and practice drills.

▶ Launch RU Род & Падежи
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English Dependent Prepositions

Verb, Noun & Adjective Regimes

Interactive reference and practice trainer for English dependent prepositions and collocation rules.

▶ Launch EN Verb Prep
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Genere dei Nomi Italiani

Italian Noun Gender Checker

Determine Italian noun gender, articles (il/lo/la), irregular plural shifts, and practice trainer.

▶ Launch IT Genere
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Reggenza Verbale Italiana

Italian Prepositional Government

Italian verb, adjective, and noun prepositional government rules with SRS practice flashcards.

▶ Launch IT Reggenza
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Γένος & Πτώσεις

Greek Gender & 4-Case Declension

Modern Greek noun gender and 4-case declension matrix with stress accent shift guidelines.

▶ Launch EL Γένος

Ready to Practice & Apply Your Grammar Knowledge?

Visit the main COSYlanguages Practice Hub for interactive curriculum exercises, lessons, and multi-skill drills!

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