*He was talking about <i><b>that</b> the eldery can be dangerous drivers on the road</i>.<br/><br/>He was talking about <b>the fact</b> <i><b>that</b> the elderly can be dangerous drivers on the road</i>.<br/><br/>He was talking about <i><b>how </b>the elderly can be dangerous drivers on the road</i>.<br/><br/>Are the words in italics declarative content clauses?<br/><br/>How come 'how' can follow 'about' but 'that' needs 'the fact' to precede it?<br/><br/>Thanks