I don't get the difference between what<i>--s</i>uch<i> </i>and awful--bad in these two examples:<br/> 'What bad luck!' 'Such awful weather!'<br/><br/>Why can't I write: <br/> 'Such awful luck!' 'What bad weather!'<br/><br/>Both sounds wrong in my ears, but it's still very easy for me to write wrong.. I appreciate your help!