assalam Walalaykumassallam brother, The saying of the prophet alayhimasaalam pray as if you see Allah SWT Allahua3lam- means make your prayers perfect and imagine Allah SWT is watching you pray, that way when your praying as if you see Allah SWT you will try your utmost best to please Allah SWT and that will help you to make your prayers as perfect as you can. for example: If your giving a speech on stage and your trying to please your teachers to get good marks by making the speech as perfect as you can because you know your teachers are watching you ie, same thing with prayer try and make them as perfect as you can because you know Allah SWT is watching you,that way your praying as if you can see Allah SWT. I hope that helps you brother. Please correct me if im wrong. And Allah knows best. Salaam