protocol
The indirect object in a sentence tells to whom or for whom the action is being done. It usually answers the question "to whom" or "for whom." For example, in the sentence "I gave her a book," "her" is the indirect object indicating to whom the action of giving is done.
The main character in a novel or story is the central figure around whom the plot revolves. They are usually the character whose actions and decisions drive the narrative forward.
Leo Tolstoy
Thomas Harris
According to astronomers, some of whom work at NASA, there are almost exactly 365 1/4 days in a year. That is what makes a year a year.
Louis the thirteenth.
The Peace Corps put the Biblical admonition 'to whom much is given much is expected' into action by sending volunteers from the U.S. around the world to help with projects such as economic development. The agency was founded in 1961.
A direct object receives the action of the verb directly, while an indirect object receives the action indirectly and usually answers the question "to whom" or "for whom" the action is done.
The subject receives the action of the verb. The dog chased the cat. what was chased = the cat.
You should use "who" when referring to the subject of a sentence and "whom" when referring to the object. In the phrase "who should I vote for," "who" is correct because it is the subject of the implied action (the one doing the voting). However, if you were to rephrase it as "For whom should I vote?" then "whom" would be appropriate as it refers to the object of the action.
In formal speech and in writing the difference between "who" and "whom" is exactly the same as the difference between "he" and "him." That is "who" can only be the subject of a verb and in all other cases "whom" is correct. Always use "whom" as the object of a verb or a preposition, as in to whom it may concern, for whom the bell tolls.
The indirect object in a sentence indicates the recipient of the action or the person for whom the action is done. It typically answers the question "to whom" or "for whom" the action is done. It often comes before the direct object in a sentence.