<p>Example Sentence: John believes that he is better than she.</p>
<p>Why is it correct with the "she" and not "her"?</p>
<p>It is really: John is better than she (is).</p>
<p>The "is" is understood so that means the "she" is following parallelism - since the first part of the sentence is "John is" the second part has to follow the same format since the sentence is a comparison one.</p>
<p>cuz John is comparing two things: who is better... either "he is" or "she is"</p>
<p>it doesnt make sense if you say John believes that he is better than her is.</p>
<p>crappy explanation. need elaboration?</p>
<p>I forget the technical term for these sentences, but they are based on how the sentence would be if it were completed. Observe:</p>
<p>John believes that he is better than she.</p>
<p>^John believes that he is better than she is.</p>
<p>However in a sentence like: John likes Jim more than her.</p>
<p>We use objective case her because it is comparing that John likes Jim more than he likes her.</p>