by juanita martinez duque 3 years ago
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We can use which with a preposition to talk about places and times. In these cases it's more common to use where or when instead of which and the preposition.
that: it can be used to refer to people, animals or things.
which: Is used exclusively to refer to animals and things. You can play the role of subject or object indifferently.
whom: Is hardly used and is used more on a formal occasion, is used when the pronoun who is the object of the verb or is accompanied by a preposition.
where: Is used to refer to places, and can be omitted only in the case of being accompanied by a preposition.