student asking question

What does "in which" mean here? Are there any relative pronouns can be replaced here?

teacher

Native speaker’s answer

Rebecca

"In which" is the same thing as the relative clause "that" in this case, except the proposition "in" in front of "in which" makes this phrase more specific. "In which" is usually more formal than other relative clauses. In this case, "that" is the only relative clause that would sound natural to replace with "in which", but in other contexts, it is also very common to replace "in which" with "where".

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