<i>a. He is that small a person = He is a person who is that small</i><br/><br/><i></i><br/><br/><i>b. He has that small a brain = He has a brain which is that small</i><br/><br/><i></i><br/><br/><i></i><br/><br/><i>c<b>. He has that short a attention span=</b> He has an attention span which is that short.</i><br/><br/>I assume only the bold c is incorrect? Why not? (Something to do with 'attention'...)<br/><br/>Thanks