In the sentence "They had to hurry because it would close very soon." the pronouns are they and it, and there are no nouns. To solve this, we must first know what a pronoun is. A pronoun is something that takes the place of a noun in a sentence. The nouns were most likely in a previous sentence, because in this sentence, there are no nouns. They is a pronoun because it takes the place of the names of the people, and it is a pronoun because it takes the place of a building.
