We aren't here just to answer homework questions
for people. Anyone in school should know how to do some basic research to find answers to questions such as this. (Not to mentiont that it should be in any accounting textbook.) Get on Google and do some research -- that's all I did.
business forms of ownership - Google Search
The second hit has some fairly straight-forward, plain English explanations of the forms of ownership. If you have questions
about what you're finding, ask them, but I'm not going to just do someone's homework for them.