知らない

Dictionary form

Past tense (katta-form)

Ku-form for adverbs (adverbial)

Te-form for connecting (kute-form)

Negative present (kunai-form)

Past form (deshita/datta)

Te-form/de-form for connecting

Causative form (make/let do)

Past plain form

Te-form for connecting verbs

Negative plain form

Negative past

Negative te-form

Polite past

Polite present/future

Polite negative

Polite negative past

Volitional form (let's do)

Passive form

Potential form (can do)

Dictionary form, plain form

Conditional form (if)

Imperative/command form