Question

Because they refer to people, alguien and nadie are often used with the personal a. The personal a is also used before alguno/a, algunos/as, and ninguno/a when these words refer to people and they are the direct object of the verb.

Answer 1

Indefinite pronouns in Spanish can take singular or plural verbs depending on the word they refer to.

Step-by-step explanation:

An indefinite pronoun is general; it does not refer to a specific person, place, or thing. Most indefinite pronouns take a singular verb, but not all. Those that take a singular verb include anybody, anyone, anything, each, everybody, everyone, everything, nobody, no one, nothing, one, somebody, someone, and something.

The following indefinite pronouns take a plural verb: both, few, many, others, and several.

Several indefinite pronouns take a singular or plural verb depending on whether the word they refer to is singular or plural. These include all, any, enough, more, most, neither, none, and some.