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Access all grammar guides, quizzes, and flashcards without paying a cent. Quality education should be accessible to everyone.
| Form | Affirmative | Negative |
|---|---|---|
| Present | 凝り固まる | 凝り固まらない |
| Polite | 凝り固まります | 凝り固まりません |
| Past | 凝り固まった | 凝り固まらなかった |
| Polite + Past | 凝り固まりました | 凝り固まりませんでした |
| Te-form | 凝り固まって | 凝り固まらなくて |
| Potential | 凝り固まれる | 凝り固まれない |
| Passive | 凝り固まられる | 凝り固まられない |
| Causative | 凝り固まらせる | 凝り固まらせない |
| Causative + Passive | 凝り固まらされる | 凝り固まらされない |
| Imperative | 凝り固まれ | 凝り固まるな |
Sottaku
Sottaku is an app for learning a growing range of Asian and European languages with a strong focus on SRS. It includes automatic flashcard creation for hundreds of thousands of words, grammar breakdowns in example sentences, language-specific study packs where available, adaptive quizzes, mobile apps, a browser extension, and community features. Give it a try now! All learning content is free with no limits on flashcards or study time.
Sottaku is built to match the habits of successful learners. By using Sottaku, you will naturally learn in the most efficient way possible, as proven by countless success stories in the language learning community.
Free Forever
Access all grammar guides, quizzes, and flashcards without paying a cent. Quality education should be accessible to everyone.
Smart SRS System
Our flashcard system uses the FSRS algorithm (also used in Anki) to optimize your review schedule and maximize retention.
Comprehensive Content
From hanzi, kana, hangul, and European vocabulary basics to grammar and reading practice where available, we have lessons for every level. Practice with quizzes tailored to your skill.
Community Chat
Ask level-appropriate questions and get help from the community. Learn together with fellow learners across every supported language.