Is none singular or plural in English

Is none singular or plural in English

For reference, none is usually used as a singular verb. For example, none is correct. But the above statement is only "general". In fact, some people will use the verb of "plural" and then of + noun. The situation becomes more complicated because some people will use this noun to decide whether to use "singular" or "plural"

The man is (our teacher)

Who is the man?

I () that man is our new teacher, Mr.Green .

Think, a notional verb in line with the meaning of the question