(1) He expressed a hope that you would soon be well again.

In the sentence (1), "that" is correct, and "that you would soon be well again" is a noun clause in apposition.

(2) This problem leads to fierce rivalry in which/that an employee must compete with 50 others. But in the sentence (2), "in which" is better. Even some English people say that "in that" is also correct. But I don't know why?

Question 1. Can you explain to me when to use "preposition + which" (adjective clause) or "that clause" (noun clause in apposition)

Question 2. What is the difference between "in which" and "in that" in the sentence (2)

I hope to receive your advice. Many thanks in advance.

  • The example is at best clumsy. 'This is a dangerous race in which many riders have been killed' is hopefully transparent, but 'This is a dangerous race[,] in that many riders have been killed' means 'This is a dangerous race, the reason being that many riders have been killed'. – Edwin Ashworth Aug 29 '17 at 8:54
  • I suggest you re-think your entire question since appositives are noun phrases, not clauses. For example, in (1) the content clause is functioning as complement to the noun "hope". – BillJ Aug 29 '17 at 9:37

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