Thesis statement?

Today my pressure went up for a while when Dr.Edwin said that each of us has to present a thesis statement. I never think about it all. I’m going to get scolding, that’s for sure. Thank God, he asked us to think of an issue first and later develop on the thesis statement. After a while it was my turn to read out what I choose to do, which was the examining the theme of class distinction through the use of language in Pygmalion. Dr.Edwin said it was ok, but has to construct it into thesis statement. I tried so many times and checked it with Dr But it was rejected since it is still an issue not what he asked for. Some of my course mates got it right; I wonder how they did it. I hope by next week mine will be approved also. It seems I got to work it out during my weekends ..Ehem…