"If you water the plants, they bloom."
This statement can be understood under this representation
p ⇒ q, where p means "you water the plants", ⇒ means "then" and q means "they bloom"
We know that the inverse is
¬p ⇒ ¬q, where ¬p means "you do not water the plants", ⇒ means "then" and q means "they do not bloom"