Pathos is the quality that makes you sad. A young child gets killed in a car accident will evoke pathos in those who witness it.
Ethos refers to the attitude and aspirations that predominate in a culture. For instance, “The American Dream” tells you that becoming rich by working hard is the ethos of modern day Americans.
Logos refers to the weight or strength of one's argument in a debate or discourse.
It is interesting to observe how Shakespeare makes use of all three in Mark Anthony's speech to the crowd. First, there is pathos: Mark Anthony with tears in his eyes, saddened by the death of his friend, Julius Caesar. Then, being aware of the ethos of the Romans, who hated dictatorship, he says “I have come to bury Caesar, not to praise him.” Only afterwards does he present his logos and stirs up their emotions against the conspirators.
Now you try the above to any of your arguments to a discourse community!