That

<p>THAT. What does it mean, and what are the uses of it?</p>

<p>Like this example:</p>

<p>A mixture of jazz and classical idioms, the music of Gershwin was more innovative [than most of his contemporaries]. </p>

<p>B. than most of his contemporaries
D. that that of most of his contemporaries</p>

<p>It should be than that of most of his contemporaries. Because you cannot compare music to people.</p>

<p>So “that” is used (in this particular sentence) “innovation”?</p>

<p>Correct. It’s necessary when you have a possessive in one side of a comparison and need one on the other. It can also be fixed other ways:</p>

<p>Frank’s dachshund is longer than that of his cousin Ned.
Frank’s dachshund is longer than his cousin Ned’s.
Frank’s dachshund is longer than his cousin Ned’s dachshund.</p>

<p>NOT</p>

<p>Frank’s dachshund is longer than his cousin Ned.
(unless, of course, you really mean to compare the length of a dog with the length of a person. But if you need to do that, you have problems even CC can’t help you with!)</p>