"I can try." If it is a question you can write, "Can I try?" I can try. -- I will attempt to accomplish something. "I can try to hit the target." Can I try? -- I would like to be given the chance to do something? "Can I try to hit the target?"

Your interpretation is correct. It is confusing, because it looks like a declaration, but it is a question. If you were speaking it, there would be a rising tone on 'try'. Use a semicolon to form a bond between two independent clauses. "He shaved his beard yesterday; we are still getting used to it." Consider that a comma has a small pause. A semicolon has a moderate pause. A period has a long pause or stop. One thing: do NOT use a semicolon with 'but', 'and', 'or', 'nor' or any other conjunction: "He shaved his beard; but he still looks good" is WRONG!

Why is there a question mark after "I can try".......? "I can try."....is a statement. And it is spoken with a rising tone at the end. It means: "I'll give it a try and we'll see what happens." If you want to ask if it is OK to give it a try then you say: Do you mind if I give it a try? Is it OK if I give it a try? Can I give it a try?

If spoken as a question, that's exactly what it means. If spoken as a statement, then no. If spoken as a statement, it means "I have the ability to try". I don't know when a ';' is used. I don't ever use it and I seem to be getting along just fine. EDIT: Thanks for the ";" clarification, FDMaxey!