Pronouns relating to plural prehistory usually require plural rejections. Another way to look at this (perhaps the simplest path): the precursor of “who” is “eccentric.” As in all cases, the precursor and the pronoun can be interchangeable. For example, Bob is nice. I like it. – > Bob is nice. I like Bob. 4. Now that we know that “who” is used as third-person plural pronouns, we find the appropriate verb. In the third person, the plural is the verb “to do.” The subject number can be singular and plural. The verb must be singular when the subject is singular, and the verb must be plural when the subject is plural. 9. In sentences beginning with “there exists” or “there is”, the subject follows the verb.

Since “there” is not the subject, the verb corresponds to the following.