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Grammar detail: verb て form + おく

verb て form + おく  put in place, do in advance
119 words
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verb て form
+
おく (to put)
means
put in place; do in advance; prepare
This very common inflection indicates the idea of putting something in place, either figuratively or literally. It's often used to indicate doing something in advance, or doing something that will be useful in the future.
For example:
する (do)しておく (take care of)
つく
る (make, prepare)
つく
っておく (make, prepare ahead of time)
ひみつ
秘密
(secret)
ひみつ
秘密
にしておく (keep something secret)
かんが
える (think)
かんが
えておく (think about something)
かのじょ
彼女
いつも
へや
部屋
きれい
She always keeps her room clean.
べんとう
弁当
つく

I made you a boxed lunch.
だれ
づく
まであなたその
けいかく
計画
ひみつ

You must keep the plan secret until someone notices it.
かんが

Please think about it.
The おく is from the verb
く which means 'to put', and so the inflection is sometimes encountered in the kanji form, て置く, but this is not customary.
Note: ておく is sometimes contracted to とく.
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Kanji used in this grammar

サク   サ   つく to make   
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ヒ   secret   ひめる to keep secret   
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ミツ    secret   
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コウ   かんがえる to think about, consider   
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チ   お to put   
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