<p>in the english section of the ACT...when they give you q question ask ask you to change it to WHO or WHOM...how do u kno which one to choose?</p>
<p>Look up the grammar rules, but all I know is that after a preposition, you most of the time use whom.</p>
<p>who = nominative/subjective pronoun case
whom = objective pronoun case</p>
<p>Whom is dative, too!</p>
<p>basically, whom is the same as him/her, and who is the same as he/she.<br>
if the sentence goes something like this, "the girl is the one who/whom they like," you would ask yourself, "do they like her?" or, "do they like she?" they obviously liked her (not she), and the answer is thus "whom," as it is the equivalent of "her."</p>