Is the verb "either of" singular or plural?

Is the verb "either of" singular or plural?

singular!

Is the predicate after "neither she nor I" singular or plural

Either... Or... Means "or Or ; not That is It means one of the two, connecting two parallel elements in a sentence
When there are two verbs, the singular and plural of the predicate are determined by the subject
When connecting two subjects, the predicate verb should be consistent with the nearest subject in person and number. This is what we usually call "the principle of proximity"

This pair of blue trousers is Tom's.The black trousers is Tom's too

The black trousers are Tom's, too

Do we need to buy any vegetables or do we need to buy some vegetables

It should be any, questions and negative sentences should use any, affirmative and hope to get a positive answer is some

Fill in the blanks with some and any do you need_______ vegetables?-----yes,I do

any
The general question is usually any
If you don't understand, please take it in time. Thank you!

This kind of vegetables ___ (be) nice.

is

Potatoes___ my favourite food.A.are B.is
Potatoes___ my favourite food.
A.are B.is

Let's not complicate the simple. If it's is, then we should say: potatoes are food? Obviously it's not right. It should be potatoes are food. So why can't we use are here? In addition, my favorite food is potatoes shows that the predicate is decided by the subject

My favorite food is / are fish and vegetable

is
According to the subject predicate principle, the subject my favorite food is singular

My favorite food is potato. Or my favorite food are potatoes?

The first sentence
Because food is uncountable, the predicate word is singular

Sentences___ My favorite food. Which one? Why

Choose "a" and "places" here as a whole. It is regarded as a "kind", so it is singular. Choose "is"