Final answer:
A possible counterexample to the conditional statement "If you walk in the rain, your shirt will get wet" could be if someone walks in the rain with a waterproof jacket, their shirt may not get wet.
Step-by-step explanation:
The statement in question is a conditional statement: "If you walk in the rain, your shirt will get wet." A counterexample is a specific instance that shows the statement to be false. A possible counterexample to this statement could be if someone walks in the rain with a waterproof jacket, their shirt may not get wet.