The following pronouns are called as indefinite pronouns as they don’t point to anybody or anything in particular.
anyone, everyone, someone, no one, anybody, everybody, somebody, nobody, anything, everything, something, nothing.
any, one, none, some, several, all, few, fewer, many, less, little, more, much,most
each, other, another.
Of these some of them are always singular, others are always plural, some are both singular and plural. The usage and context will decide whether they will singular or plural.
The following pronouns are always singular.
No one knows that I have the key to the riddle of the cosmos.
Nothing is known about the lions which went missing from the zoo.
Everybody looks to Messi as their football guru.
Everyone loves to be in the shoes of Michael Jackson
Nobody knows anything about plane crash
Anything goes with a cup of well-brewed coffee
Anybody has the key to the lock?
Something is seriously wrong with the conductor of the orchestra.
Someone is going to be punished for this terrible accident.
Somebody is going to tell me where to find the cakes hidden in the kitchen.