Either Ahmad or Ali is visiting us tomorrow.

[abo.omar]

1- Either Ahmad or Ali is visiting us tomorrow.
2- Either Ahmad or Ali are visiting us tomorrow.
3- Either Ahmad or my to cousins are visiting us tomorrow.
4- Either Ahmad or I am participating in the game tomorrow.
-Are these sentences correct?
-Do we use singular verb or plural verb after either and neither?

 

[Skrej]

With 'either/or' and 'neither/nor', the verb should agree with the subject closest to it.

Same thing for 'or','nor', and 'not only/but also'.

#2 is incorrect. With #3, you have a spelling error. The number is 'two', not 'to.