Hi,<br/>I am going to write what I think is a typical sentence that denotes ability for the modal "can".<br/><br/>I can lift this chair.<br/><br/>If I change that into a question, did I keep the ability part intact? Or is that a request? Or could it be a request with ability in part?<br/><br/>Can you lift this chair (for me)?<br/><br/>If I changed 'can' into the modal verb 'could', Would I still have the ability part there functioning as it should but more polite?<br/><br/>Could you lift this chair?