Assuming that I am talking about my English books. Which one is correct?<br/><br/> 1. I have a lot of <b><span style="color:#b22222;">grammatical </span>books</b>.<br/> 2. I have a lot of <b><span style="color:#b22222;">grammar </span>books.<br/></b><br/> I'd choose #2. However, I am not sure about #1. Is it natural to you?<br/> Thanks.