If I can't continue

[e2e4]

If one can't continue doing something what has happened to him?

Thanks

[Barb_D]

Can you explain the context a bit more?

He may have come to an impassable barrier, been reassigned to a new project, run out of time, dropped dead...

If you describe the situation you have in mind, we can come up with some ways to word it.

[e2e4]

I simply meant, was he stuck?

Is that the right word if he's come to a barrier on/at? doing something?

Actually if one doesn't know what to do to continue? How to continue.
Or if he doesn't know what decision would be right.

[Barb_D]

Sure, you can say "I'm stuck. I don't know the answer to this question, and I can't go on until I get that one right."