An indeterminate pronoun in the function of a noun has a number (an est; many are). If the subject is expressed by an indeterminate pronoun in the function of a subject, use the following general principles of subject-verb concordance. 2. If two or more singular nouns or pronouns are related by or not, use singular verbatim. Rule 3. The verb in an or, or, or, or not, or ni/or sentence corresponds to the noun or pronoun closest to it. Some collective nouns are usually used with a singular verb (the bourgeoisie, the proletariat). Other collective nouns are usually used with plural verblage (police, militia, clergy). However, the plural is used when the focus is on the individual in the group.
It is much rarer. Don`t be confused by the word „student“; the subject is each and everyone is always singular Everyone is responsible.