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who: it is used when we ask about the person itself. e.g., Who is your best friend? whom: it is used when we are going to ask/relate something/event/incident/belonging/object/etc, to a person. e.g., To whom should I concern this?
Who is used for the subject. This is the man who stole my car. Whom: is used for the object. Ex: This is the man whom I called yesterday.
The word. Who is relatuve firts name. And word also. Refers to questions. Word , example. Who is you dog? Relative pronoum word
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Start testWho refers to a subject, a subject is the performer of an action in a sentence. Who is used when the word is performing an action. Whom refers to an object, an object is the receiver of an action in a sentence, whom is used when the word is receiving an action from the subject.
To whom are you talking? Who are you talking to?
Here are two grammar structures which help show when they are used: To whom is the letter addressed? (Using grammar structure 'To whom' Who is the letter addressed to? (Using wh-question word 'Who') Hence you can choose 1 of these questions-they look different, have different grammar structures but they have the same meaning.
If your answer is a subject pronoun, you use "who" If you use objective pronoun, "whom" is correct