Is the predicate after staff plural or singular? When staff ends as an employee, most of the predicates are plural But it's said that singular numbers are also useful When to use singular?

Staff is a collective noun. The predicate can be plural, but when expressing a whole, it can also be singular

A number of + noun + predicate plural
What is the plural form of predicate?

There are a large number of new books in our school library this term

Is the predicate after more than a student singular or plural

Singular. Here we have to follow the same form

Wait, not only a student, singular or plural? More than one student?
All of a sudden, the more I think about it, the more tangled I am
Please don't talk nonsense if you are not sure
The wrong number should be not just one student

Singular number
complex

English grammar question: can we only add singular countable nouns after more than one

More than one student has read the book.
Many a student has read the book.
Although the subject of these two sentences is plural in meaning, its form is singular, so when the subject and predicate are consistent, it is the same as the form
More students than one have read the book
Although the meaning of the sentence has not changed, the form of the subject has changed. Therefore, this kind of subject predicate agreement is also called "a kind of form" or "grammatical agreement", which is different from "semantic agreement"

More than one + n (odd)
Let's talk about the grammar

1. More than one + n (singular)
More than one
More than one person is involved in this.
There is more than one person involved in this matter
2. Similarly, "many a + singular noun" also uses singular verb
e.g.:
Many a famous pop singer has been ruined by drugs.
Many famous pop singers have ruined themselves by taking drugs

The difference between a quantity of, the quantity of and quantities of
Isn't the first one based on the following nouns?

The first and the third both denote a large number of nouns and can modify countable and uncountable nouns, but the predicate verb after the first one is in simple three form, and the third one is in general form
The second means "the number of... Is", and the predicate verb is in the form of simple three

a large amount of large amounts

No, a large amount of should be followed by a noun

The difference between a large amount of and a large amount of
When to add a before amount of
Isn't amount of only countable nouns?

I think you should have the wrong number. No matter what the form of amount is, it is followed by uncountable nouns
There are two forms of "many"
an amount of
amounts of
So I think the amount in the second phrase should be plural
large amounts of

Is the predicate after staff plural or singular? When staff ends as an employee, most of the predicates are plural But it's said that singular numbers are also useful When to use singular?