What Are Their Main Differences?
These Pronouns as Interrogative Pronouns
'Who' and 'Whom' as Relative Pronouns
Now, that you know the main difference between 'who' and 'whom'; It is good to know that 'who' and 'whom' are used in relative clauses as relative pronouns to connect the sentences. Keep in mind that you can use them either in restrictive or non-restrictive clauses.
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Important to Know!
Do not forget to put a comma on both sides of a non-restrictive clause.