As you know, we can ommit the subject in the sentencess in Farsi, because we can guess the subject from the suffixes that are added to the end of the verbs. For example: من می روم ===» می روم So you will understand who is going. Here in the verb mibinamet, the subject and object are ommited and insted of تو we attach ت to the end of mibinam and it becomes می بینمت. The second form is also correct but when you want to say see you when you want to say goodbye to someone, you can just say می بینمت not to ra mibinam.