Neither ... nor

Hi,
We must use the singular or plural verb after “neither … nor”?
Thanks,
Morteza

I presume that you mean with singular subjects. In that case, the singular is formally correct, but the plural is also in informal use.

What about the sentence Neither he nor I…mister?

Neither he nor I want to deal with this.

Thank you. So, the verb form depends on the latter noun right?

Yes.