Meaning & usage
のに marks the action that requires time, money, effort, or evaluation in the main clause, meaning for doing or in order to do something. It follows the dictionary form of a verb, as in 買うのに or 走るのに, often with predicates about need, difficulty, duration, cost, or suitability. It cannot replace ために for a plain purpose action, so the main clause must describe a cost or judgment rather than a volitional act.
Example sentences 6
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彼はホテルにたどり着くのに苦労した。
He had difficulty in finding his way to the hotel.
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このデータを集めるのに三ヶ月を費やした。
I spent three months compiling this data.
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その仕事を終えるのにどの位時間がかかりますか。
How long will it take to finish the work?
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その車を買うのに十分なお金があればいいのになあ。
I wish I had enough money to buy the car.
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欲しい物を買うのに、あと300ドル要るの。
I need another three hundred dollars to buy what I want.
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この靴は走るのに適していない。
These shoes are not suitable for running.
In past JLPT papers
This came up in 10 past exam questions.
And 5 more tests.