1. I don't know him. This is absolutely true. 2. I don't know him very well. (I may have heard of him.) 3. It is certain that Jack does not want it. 4. Jack is not completely sure that he wants it. (He seems to want it; he may change his mind.) 5. In reality, the student didn't copy the book (once the facts were known). 6. The student didn't copy