A dummy pronoun, also known as an expletive pronoun, is a deictic pronoun that fulfills a syntactical requirement without providing a contextually explicit meaning of its referent.[1] As such, it is an example of exophora.
Dummy pronouns are used in many Germanic languages, including German and English. Pronoun-dropping languages such as Spanish, Portuguese, Chinese, and Turkish do not require dummy pronouns.[2]
A dummy pronoun is used when a particular verb argument (or preposition) is nonexistent – it could also be unknown, irrelevant, already understood, or otherwise taboo (as in naming taboo) – but when a reference to the argument (a pronoun) is nevertheless syntactically required. For example, in the phrase "It is obvious that the violence will continue", the term 'it' is a dummy pronoun, not referring to any agent. Unlike a regular pronoun of English, it cannot be replaced by any noun phrase.[3]
The term 'dummy pronoun' refers to the function of a word in a particular sentence, not a property of individual words. For example, 'it' in the example from the previous paragraph is a dummy pronoun, but 'it' in the sentence "I bought a sandwich and ate it" is a referential pronoun (referring to the sandwich).