nihongo-net.com/category/grammar/
Collection of grammar lessons covering verb conjugation, particles, and grammar patterns for JLPT N5 and N4 levels. Offers explanations of forms like te-form, ta-form, conditional, and passive voice.
GrammarJLPT and other testsJLPT N5JLPT N4Verb conjugationParticlesSentence patternsJLPTConditionals