The following is a summary of what you must understand to perform these functions. You will use them for obversion and contraposition. But in the case of multi-word terms this sometimes doesn't make any sense. In such cases you reduce the scope of the discourse. Use your common sense for this and you'll do fine.
Conversion is the simplest operation to perform.
All you do is switch the subject and predicate term . You must remember that conversion is only to be used on E and I statements. When you use conversion on an A or O statement, the resulting statement does not necessarily have the same truth value as the original, making it unreliable for drawing inferences. I remember that conversion is valid for E and I statements by looking at the name of the operation. You must replace the predicate term with its complement .