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CASES OF RELATIVE PRONOUNS AND INTERROGATIVE PRONOUNS
subjective objective possessive
who whom whose
whoever whomever
 
The same rules for subjective, objective, and possessive apply for these nouns. It is easier to distinguish I from me and he from him, but who and whom continually give many people trouble in choosing in sentences.x

 

The boy (who, whom) won first prize in the spelling bee.... 

 

May change cases, therefore, it's difficult to know what to use. However, there is a method around this confusion.

 

The Replacement Method 

1. Eliminate all words before the pronoun in question:   (who, whom) won the first prize in the spelling bee.... Now choose the pronoun. If you're still confused about which to chose, contine on... 

2. Replace the relative pronoun with a personal pronoun:   (he, him) won the first prize.... Obviously, he is the correct choice in this sentence, and he is subjective case. 

3. So, go back to the original sentence and choose the pronoun with the subjective case. The correct choice in the subjective case is who:  The boy who won first prize in the spelling bee....