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What is the difference in the usage of "whom" and "who"? please also tell me the rules behind their usage and some examples to clarify their difference.

marked as duplicate by RyeɃreḁd, Third News, anongoodnurse, J.R., FumbleFingers Jun 29 '14 at 12:37

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Basically, who refers to the subject while whom refers to the object of a sentence/clause.

Example:

The person whom I talked to on the phone turned out to be the manager of the restaurant.

In this case, I am the subject as it is me who does the action (i. e. talked on the phone) while the person is the object: I talked to him, not to he.

A good resource describing how to identify the subject vs the object and relating this to the whom vs who question that is not too crammed with linguistic information can be found here

Be aware, though, that in many places whom is rarely used, if at all. I have heard people using who instead plenty of times in several different English speaking countries. This is not to say that whom shouldn't be used or that it is appropriate to replace it with who. Just be careful not to sound condescending or the like by using rarely used grammatically correct forms around people who don't use them. In writing, of course, you can use it freely, although even in writing many people tend to use who instead.

Also check out the question smithkm has linked in a comment to your question saying your question might be a duplicate.

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