How to get a value out of a module script?

Question Was Edited Because I Did not explain well

so what i want to is create a value in a main script that stores if a player can attack. Then i want a module script to check if a player can and activates a variblethen that varible should be send back to the main script

A script explained version

Module.CheckIfCanAttack(CanAttack)

if CanAttack then
--Attack
end

Module script

function Module.CheckIfCanAttack(CanAttack)
CanAttack = True
end