一般不说你们还没有付钱,而是当发现客人准备离去时说:“所以,总共是500元,先生”之类的话,以此来提醒客人付钱。也就是:"so,that's500dollars,sir"或者对多人:"sogentlemen,yourtotalbillis500dollars.thankyou."如果你实在要那样表达,那就是:i'mafraidyouhaven'tpaidyetsir.
You haven't paid for it yet.