What is the main clause of have you seen my textbook rafeal?

The main clause of the sentence "Have you seen my textbook, Rafeal?" is "Have you seen my textbook". The main clause is the part of the sentence that contains the subject and the verb and expresses a complete thought. In this case, the subject is "you", the verb is "have seen", and the object is "my textbook". The phrase "Rafeal" is a vocative, which is a word or phrase used to address someone directly. It is not part of the main clause.