1. When the boss says you have worked hard, you should say you should (because when the boss says you have worked hard, he sees your efforts, and when he says you should, he will feel that you are really working for the company).
2. When a friend says that he has worked hard, he should say that he is OK, or that he has no problem, which is trivial (when a friend tells you that you may have helped him if he has worked hard, he will tell you that he has worked hard only because he is grateful to you. Since it is to ask you for help, it must be a problem that the friend cannot solve himself. Anyway, no problem, which is trivial, it will be very good).
3. If a close friend says so, then say "Go away" (if a close friend says so, are they so familiar?)
4. The family said it was hard, so it should not be hard. (Since the family said so to you, they pity you for being tired.).