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Grammar detail: verb causative form

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JLPT:
verb causative form - make something happen
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The causative form of a verb means to make the verb happen.
For ichidan (る) verbs, the causative is formed by replacing the る with させる:
べる to eat ➜
べさせる make eat
For godan (う) verbs, the causative is formed by replacing the last sound (containing the う) with the equivalent あ sound, and adding せる:
う to buy ➜
わせる to make buy (note the use of わ)
く to listen ➜
かせる to make listen
はな
す to speak ➜
はな
させる to make speak
つ to wait ➜
たせる to make wait
ぬ to die ➜
なせる to make die
あそ
ぶ to play ➜
あそ
ばせる to make play
む to read ➜
ませる to make read
はじ
まる to begin ➜
はじ
まらせる to make begin
The causative of 'wait',
たせる, is the root of the expression おたせしました, which is used to mean 'sorry for keeping you waiting', but literally actually only means 'I made you wait'.
As usual する and くる are irregular, and their causatives are させる (make do) and こさせる (make come).
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See also:
  • Key verb conjugations

Kanji used in this grammar

ショク   ジキ    food   たべる to eat   く to eat   
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バイ   か to buy   
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ブン   モン   き to listen, to hear   きこえる to be heard   
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ワ   はな to talk   はなし talking   
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タイ   ま to wait   
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シ   death   し die   
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2
ユ   ユウ   あそ play   
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ドク   トク   トウ   よ to read   
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シ   はじめる to begin, to start (something)   はじまる to begin, to commence   
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