1) i am confused how to use prep<br/><br/> My teacher say that emphasis should be used with the prep "on"<br/><br/> (1)They put the emphasis on quality.<br/><br/> (2)The emphasis of/on quality should be pay attention to. &lt;&lt;Which prep is right?<br/><br/>2) resquest (n) + for + something<br/><br/> If i don't want to memtion "something", Can i say "Her resquest is unreasonable." and why?<br/><br/>3) pay attention(n) + to <br/><br/>If i don't want to memtion "something", Can i say "his mun never pay attention" and why?