Qual è la differenza tra difficult e tough ?Sentiti libero di rispondere con un esempio.

About problems:
This is a tough problem = This is a difficult problem
We have a tough road ahead = We have a difficult road ahead

About people:
He's a pretty tough negotiator = hard to negotiate against.
He's a difficult person = hard to deal with.
He's a tough person = usually would mean they are resilient, they can take any hardship and keep going.
I can't imagine surviving a wartime prison camp, but he had the sort of toughness that helped him survive.

About physical things:
This piece of meat is overcooked, it's too tough to eat. (Can't substitute "difficult" here.)