bunpro.jp/topics/i-wont-be-doing-that
Interactive grammar lesson on the polite form ます and negative forms ない and ません, with explanations of auxiliary verbs, conjugation rules for る-verbs and う-verbs, and practice drills for JLPT N5 level learners.
GrammarKeigo and politenessVerb conjugationJLPT N5Example sentencesQuizzesAppsSpaced repetitionSentence patternsTextbooksKanaAdjectivesTranslationParticles