高校生向けの英語問題集の中に、

Derek found an ideal environment in which to learn foreign languages. (デレックは、外国語を学ぶための理想的な環境を見つけた。)

という例文があります。これは、関係代名詞の後に続く部分が節でなく、to 不定詞の句になることがあるということを知らないと、戸惑います。。「前置詞+関係代名詞+to 不定詞」の形で使われるようです。『ロイヤル英文法』では、不定詞の形容詞的用法のセクションに詳しい説明があります。また江川『英文法解説』にも不定詞の形容詞的用法として例文が掲載されています。

グーグルスカラーで”in which to”を検索すると183万件もヒットしますので、インターネットから例文をいくつか拾ってみます。

The Most Fulfilling Jobs And Cities In Which To Work (http://www.forbes.com/sites/karstenstrauss/2016/12/08/the-most-fulfilling-jobs-and-cities-in-which-to-work/)

“This generous gift will help us provide the tigers with a larger and more complex space in which to live,” said Ron Kagan, Detroit Zoological Society executive director and CEO in a statement. (http://www.detroitnews.com/story/news/local/oakland-county/2016/12/22/detroit-zoo-tiger/95751738/)

Yet it is still a fairly cheap place in which to live and work. (https://www.theguardian.com/small-business-network/2016/dec/22/chile-accelerator-startup-grants)

以下は、書籍からの例文。

  1. San Diego has been a fertile community in which to work, and many people have offered sustaining encouragement. (Preface page xi)
  2. The Cases of China, Japan, and Korea, provided contexts in which to discuss chapters 2, 6, and 7. (Preface page xii)
  3. The one required economic internationalism to expand labor and capital, to secure raw materials and consumer markets, to locate areas in which to invest surplus capital, and to provide a safety valve for domestic tensions; the other required consolidation of a strong, hegemonic nation-state in order to regulate the terms of that post-war economic internationalism. (Page 15)
  4. Just as Ileto proposes a “nonlinear employment of history” that maps, rather than narrates, spaces of insurrection and suppression, I consider Ng’s Bone as a novel that explores space as a category in which to read about the emergence of and the obstacles to Asian American social life over the past century.(Page 120)

(引用元:グーグルブックス Lisa Lowe著 Immigrant Acts: On Asian American Cultural Politics)

参考

  1. 前置詞+関係代名詞+to不定詞のまとめ (NAVERまとめ)