Dummy and Impersonal Pronouns

(subjective third-person singular pronoun) used when referring to something or an animal as the subject of a sentence

It is raining heavily outside.

at a place that is not where the speaker is

Your keys are there on the counter.

the number 1

I have one book.

(subjective third-person plural pronoun) used when referring to the things or people that were already mentioned

They are coming to visit us next week.

(second-person pronoun) used for referring to the one or the people we are writing or talking to

Can you please pass me the salt?