"Assume" and "presume" have a similar meaning. They both mean that you think something will happen, before it actually happens. The difference is that "assume" means to believe something without any proof. Ex. "I assume that my girlfriends dad won't like me." or "I presume that I will be working overtime tonight. (Because you worked overtime everyday for the past week)" Suppose is usually concluding a thought or act. It's usually an act of agreement or sometimes synonymous to "I guess". Ex. "I suppose we can go watch a movie". - (I guess we can go watch a movie) I hope this helps!