How do we solve logic problems using conditionals?

In the logic unit, we are not looking at one statement at a time. If "and", "or" is in a statement it is true if one is true and vice versa. Conditionals are the most frequently used statements in the construction of an argument.

Ex) 

Inverse: formed by negating the hypothesis & conclusion

  - If it is cold, then i will take my coat

  - If it is not cold, then i will not take my coat

Converse: is just switching the hypothesis and conclusion

  - If today is Friday, then tomorrow is Saturday

  - If tomorrow is Saturday, then today is Friday

Contrapositive: contra- prefix meaning "against" or "opposite"

  - If i am tired, then i will go to sleep

  - If i am not asleep, then I am not tired

Bi-conditional: when the conditional and the converse are both true

  - If my shoes are untied, then I will tie them

  - I will tie my shoes if and only if they are untied

Question:

Make a conditional using this phrase:

   If today is Monday, then yesterday was Sunday.