usage of ANY

[Anonymous]

Hello teacher.
Would you tell me why "any bank" is used in the first and third sentences below , while "any banks" is used in the second, fourth and fifth ones?

1.I don't know of any bank that is open on national holidays.
2.No, there aren't any.
3.Is there any bank open at night?
4.Are any banks open yet?
5.Do any banks here give gifts to customers opening new accounts?

Thanks!

[RonBee]

It is the verb that drives the sentence.

I don't know of any bank that is open on national holidays.

Singular verb (is); singular noun (bank).

Is there any bank open at night?

Singular verb (is); singular noun (bank).

Are any banks open yet?

Plural verb (are); plural noun (bank).

Do any banks here give gifts to customers opening new accounts?

Plural verb (are); plural noun (bank).

8)

[Tdol]

When you say 'any bank' you are thinking of just one, which is all you need.