Question

I (mustn’t / should) do something to help them.​

Answer 1

Grammar-Wise, both options could be considered correct.

But morally, the second option (should) seems to be better.

Thus, I would go with should

However, do keep in mind the answer will probably change according to the context and the speaker, etc. ,etc.

Hope this Helped! Stay Safe & Stay Sanitized! <3

Answer 2

Answer:

Answer:I should do something to help them.