I did my M.Sc. recently and we have agreed to publish it in a journal with my supervisors. I have got once comments from the first supervisor but it is almost two months I couldn't got the final comments. I have followed up it and the supervisor mentioned he would give comments shortly. I am worry he may want to refuse from contributing, and he couldn't mention it, directly. He may have any convincing reason for him self for refusing from authorship but I am pretty sure the quality is good enough and it can be published in a journal.
How can I politely ask his decision?
Should those papers that are derived from thesis include supervisors name?