~出す, ~切る, ~込む, ~直す in Japanese: V2 Aspect Suffixes (Sudden Onset, Completion, Inward/Depth, Redo)
~出す, ~切る, ~込む, ~直す in Japanese sorted at N3: sudden onset, completion, inward depth, redo, plus the dasu-vs-hajimeru and naosu-vs-naosu splits.
~出す, ~切る, ~込む, ~直す in Japanese sorted at N3: sudden onset, completion, inward depth, redo, plus the dasu-vs-hajimeru and naosu-vs-naosu splits.
~始める, ~終わる, ~続ける in Japanese sorted at N4: V-stem + suffix recipe, lifecycle frame (onset, duration, endpoint), and verb-class compatibility.
Compound verbs in Japanese (複合動詞) sorted at N3: the V1-stem + V2 recipe, lexical vs syntactic compounds, common V2 suffixes, and reading aids.
Map the Japanese giving and receiving verbs at N4: あげる, くれる, and もらう as one paradigm, with the in-group rule and the 差し上げる / くださる / いただく chain.
Japanese transitivity pairs list: 50 自他動詞 pairs grouped by the five recurring patterns, with kanji, kana, JLPT level, gloss, and one example each.
Japanese verb classes by aspect sorted: Kindaichi's 状態, 継続, 瞬間, 第四種 split, the ている-substitution test, and why 知っている means "know," not "is knowing".
Japanese verb groups sorted: 一段 (ru-verbs), 五段 (u-verbs), and the two irregulars する and 来る, with the iru/eru-ending trap and a textbook reconciliation.
Suru-verbs explained: how する verbalizes 漢語, 外来語, and 和語 nouns, with the 勉強する vs 勉強をする split and the ずる/じる sub-pattern, for JLPT N5 learners.
The Japanese imperative form (命令形) at N4: plain command rules for 一段, 五段, and irregulars, the soft 食べな vs prohibitive 食べるな, and social register.
The Japanese verb stem (連用形 / masu-stem) sorted at N4: how to form it for godan, ichidan, and irregulars, and its three productive uses.
Masu form Japanese verbs sorted by group: 一段 drop る, 五段 shift to い, plus the full ます / ません / ました / ませんでした paradigm and the stem reuse for N5 learners.
Nai-form (ない形): plain-negative conjugation for ichidan, godan, and irregulars, the ある to ない exception, past なかった, and what builds on it.
Polite volitional ~ましょう sorted at N5: masu-stem + ましょう, the "let's" suggestion, ましょうか for "shall I?" and "shall we?", and ましょう vs ませんか.
The ta-form in Japanese: construction rules sorted by class. 一段 drops る; the five 五段 clusters are った, んだ, いた, いだ, した; plus the three irregulars.
Te-form benefactive in Japanese at N4: 〜てあげる, 〜てくれる, and 〜てもらう as one paradigm, the 〜てあげる condescension trap, and the 〜ていただく request ladder.
The te-form in Japanese, sorted by class: 一段 (drop る), the five 五段 clusters (って, んで, いて, いで, して), the three irregulars する, 来る, 行く, plus the song.
Te-form uses in Japanese, sorted: sequence, cause, manner, the 〜てください request, the bare-て soft command, and auxiliaries (ている, てある, ておく, てしまう, てみる).
Transitivity pairs in Japanese: why 自動詞 and 他動詞 come in pairs, the five recurring patterns (-aru/-eru, -ru/-su, -reru/-su, -u/-eru), and the が vs. を split.
ある vs. いる in Japanese, sorted at N5: the animacy rule (not "alive"), both conjugations with the ある to ない exception, vehicles, robots, and 経験がある.