1. Conditional
Original IF-THEN statement

2. Converse When you switch both the hypothesis and conclusion
If HYPOTHESIS, then CONCLUSION
If CONCLUSION, then HYPOTHESIS

3. If HYPOTHESIS, then CONCLUSION
Inverse Think: INSERT
When you leave the conditional the way it is & make it negative
NOT NOT
If HYPOTHESIS, then CONCLUSION

4. Contrapositive Think: COMBINATION
When you switch both the hypothesis & conclusion, AND insert a negative
BEFORE: If HYPOTHESIS, then CONCLUSION
NOT NOT
If CONCLUSION, then HYPOTHESIS

5. Things to keep in mind
If it is already Negative, and you are taking the inverse of contrapositive, then you get rid of the NOT Conditional: If you do NOT like cheese, then you do NOT like pizza INVERSE: If you like cheese, then you like pizza

6. Biconditional Combines the Condition & Converse
If BOTH are true, then it is biconditional
Include the words: IF AND ONLY IF
Example:
If a shape is round, then it is a circle.
If it is a circle, then the shape is a circle.
A shape is round, IF AND ONLY IF, it is a circle.

7. Detachment

8. Syllogism