🤔When should "In which", "at which", "from which" and "to which" be used?
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There is some confusion over when to use "in which," "at which," "from which" and "to which." The general rule is that the first three should be used to introduce a clause, while "to which" should be used to introduce a phrase.
However, there are exceptions to this rule.
For example, you might say "the book in which I found my pen" or "the store at which I bought my hat." In these cases, it sounds better to use the word that begins with a letter other than W.
@english_with_nab
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