I am sad that I can't do the job recommended by my friend, and I don't know how to tell others.

How can I put it? This is the art of speaking. You want to refuse him, but you are afraid of hurting his self-esteem. . . Sweating is a bit like that. . In fact, we are all men. You think too much. Just tell him: Dude, I can't do this job. I'm sorry, but thank you! We will cooperate again in the future. Believe in your friendship!

You don't say what's wrong or what to do. He won't be happy if you say that! Why? Because it raised his standards. He'll think he can do anything. Why can't you? This reminds me of a real joke: Dude, I won't introduce you until I have a manager and president.

Just say no, don't ask: can I resign? In that case, if he says no, there is nothing you can do.

I hope I can help you.