A. Pronouns that refer to multitudes are generally treated as singular entities (even when used in combination)
Each, every, either, neither, everything, everyone, everybody, anyone, and anybody
Either movie is good.
Neither of the singers wants to retire.
Where has everybody gone?
Anything and everything goes.
Each and every sock was lost in the wash.
B. Pronouns referring to multitudes are treated as plural when associated with a multitude and singular when associated with a quantity.
All, more, most, some, any, and none
All the scholarships have been awarded.
All the snow was melted.
Is there some salt in the shaker?
Are there any questions?
C. None can be singular or plural depending on whether it stands for not one or not any
The cakes look the same; none stands out.
None but the especially clumsy fall down these stairs.