～のに (for doing)
For doing or useful for doing
You'll be able to explain what an object is used for or what is needed to perform an action.
このはさみは紙を切るのに便利です。
kono hasami wa kami o kiru noni benri desu.
What do you think this sentence means?
These scissors are useful for cutting paper.
Evaluate something for an activity
This のに connects an activity to a judgment about the tool, resource, cost, or time it needs. It often translates as “for doing” rather than “although.”
旅行するのにお金が必要です。
ryokou suru noni okane ga hitsuyou desu.
Money is needed for traveling.
Form and use ～のに (for doing)
Use it with 便利, 必要, 使う, or かかる. It is not a general replacement for every “in order to” clause. This の nominalizes the activity and に relates it to the evaluation.
旅行するのにお金が必要です。
ryokou suru noni okane ga hitsuyou desu.
Money is needed for traveling.
この本を読むのに二時間かかりました。
kono hon o yomu noni nijikan kakarimashita.
It took two hours to read this book.
For doing or even though
The same のに can link an activity to the time or resources it needs, or contrast a fact with an unexpected result. Read what follows のに to tell which meaning fits.
読むのに, for doing
この本を読むのに二時間かかりました。
kono hon o yomu noni nijikan kakarimashita.
It took two hours to read this book.
The following かかりました gives the time needed for reading.
読んだのに, although
この本を読んだのに、内容が分かりませんでした。
kono hon o yonda noni, naiyou ga wakarimasen deshita.
Although I read this book, I did not understand its contents.
The book was read, but understanding did not follow as expected.
このかばんは旅行に行くのに便利です。
kono kaban wa ryokou ni iku noni benri desu.
This bag is handy for traveling.
東京で部屋を借りるのに、いくらぐらい必要ですか。
toukyou de heya o kariru noni, ikura gurai hitsuyou desu ka.
About how much do you need to rent an apartment in Tokyo?
このレポートを書くのに一週間かかりました。
kono repooto o kaku noni isshuukan kakarimashita.
It took me a week to write this report.
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