Japanese/Ways to split verbs.md
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@@ -36,10 +36,33 @@ The less common ones are:
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- 干る (ひ.る) - to dry
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- 経る (へ.る) - to pass
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+### Using the transitive verb pairs
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+If a verb has a transitive and intransitive variant, then the transitive variant ending with eru or iru is usually ichidan
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+hajimeru is ichidan because there exists hajimaru
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+akeru is ichidan because there exists aku
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+ochiru is ichidan because there exists otosu
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+
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+Exception: this will most likely not work for -u -asu verb pairs:
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+chiru chirasu
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+heru herasu
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# 自 vs 他
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-## How to tell apart
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+## How to identify
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+- aru, oru is always intransitive
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+ - 始まる（はじ.まる） - to begin
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+ - 上がる（あ.がる） - to rise
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+ - 変わる（か.わる） - to change
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+ - 起こる（お.こる）- to happen
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+- asu, osu is always transitive
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+ - 溶かす（と.かす） - to melt (something)
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+ - 落とす（お.とす） - to drop (something)
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+- eru and u can be either transitive or intransitive, when paired with -asu or -aru they will be the opposite type
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+ - 始める（はじ.める） is transitive because 始まる（はじ.まる）is intransitive
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+ - 溶ける（と.ける） is intransitive because 溶かす（と.かす）is transitive
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+- otherwise, one must learn which verb is which
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+ - 開ける（あ.ける）is transitive and 開く（あ.く）is intransitive
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+ - 切れる（き.れる） is intransitie and 切る （き.る）is transitive
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# 変化 vs 動作
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-## How to tell apart
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+