|Singular||Plural||Singular or Plural|
anybody, anyone, anything
everybody, everyone, everything
nobody, no one, nothing
somebody, someone, something
You noticed before that indefinite pronouns fall into three categories. The singular pronouns take a singular pronoun. The plural indefinite pronouns take plural pronouns.
Everybody needs his or her pencil.
Many will need their tablets.
Beware phrases that follow the indefinite pronoun. Agreement still needs to be with the pronoun, not the object of the preposition.
Each of the students is missing his or her homework.
Many of the students are missing their homework.
With the "singular or plural" pronouns, you need to look at the prepositional phrase that follows the pronoun in order to determine whether the meaning is singular or plural.
All of the cake is missing its frosting. (All of the cake is a singular quantity.)
All of the cake slices are missing their frosting. (All of the slices is a plural quantity. You can count this.)
All of the students are missing their notebooks. (All of the students is a plural quantity. You can count it.)