This study aims to collect and thoroughly study the differences between the morphological probabilities hidden in the book of Tayseer Al Tafseer. It also will discuss the morphological interpretation features of exposition scholars and scientists. The case study of this research, which is Mohammed Yusuf Atfaish; is considered as one of the leading scholars in this field. He has written three books in the field of Morphological interpretation. This study also tends to represent the scientific high dignity of the above-mentioned book; which is considered one of the largest records to study the interpretation principals in Ibadism. The study has been categorized to four chapters. The first one will discuss the Nouns, the second one will deal with Verbs, the third one will study the relation between the Noun and the Verbs; and finally the fourth will discuss Atfaish's methodology regarding the morphological selection and probability. The study will be ended by a conclusion consists of the outcomes and recommendations of the research. The most important and essential outcomes of the research are: 1- Atfaish never proclaim his own opinion in the morphological dispute issues except in few contexts. 2- He rejects some unrealized opinions and explanations; such as "Fatwan" for "two boys" and the originality of the letter "Meem" in the word "Ma'een". 3- He changed and edited many of his ideas in his previous book "Hayman al Zad Ila Dar Al Miaad". 4- His ideas and probabilities depend on hearing and the originality concerning.