Dummy pronoun
Encyclopedia
A dummy pronoun is a type of pronoun
Pronoun
In linguistics and grammar, a pronoun is a pro-form that substitutes for a noun , such as, in English, the words it and he...

 used in non-pro-drop language
Pro-drop language
A pro-drop language is a language in which certain classes of pronouns may be omitted when they are in some sense pragmatically inferable...

s, such as English
English language
English is a West Germanic language that arose in the Anglo-Saxon kingdoms of England and spread into what was to become south-east Scotland under the influence of the Anglian medieval kingdom of Northumbria...

.
It is used when a particular verb argument
Verb argument
In linguistics, a verb argument is a phrase that appears in a syntactic relationship with the verb in a clause. In English, for example, the two most important arguments are the subject and the direct object....

 (or preposition) is nonexistent (it could also be unknown, irrelevant, already understood, or otherwise not to be spoken of directly), but when a reference to the argument (a pronoun) is nevertheless syntactically
Syntax
In linguistics, syntax is the study of the principles and rules for constructing phrases and sentences in natural languages....

 required.

For instance, in the phrase, It is obvious that the violence will continue, it is a dummy pronoun, not referring to any agent
Agent (grammar)
In linguistics, a grammatical agent is the cause or initiator of an event. Agent is the name of the thematic role...

. Unlike a regular pronoun of English, it cannot be replaced by any noun phrase
Noun phrase
In grammar, a noun phrase, nominal phrase, or nominal group is a phrase based on a noun, pronoun, or other noun-like word optionally accompanied by modifiers such as adjectives....

 (except for, rhetorically permitting, something like 'the state of affairs' or 'the fact of the matter'.)

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).

Weather it

In the phrase It is raining, the verb to rain is usually considered semantically
Semantics
Semantics is the study of meaning. It focuses on the relation between signifiers, such as words, phrases, signs and symbols, and what they stand for, their denotata....

 impersonal
Impersonal verb
In linguistics, an impersonal verb is a verb that cannot take a true subject, because it does not represent an action, occurrence, or state-of-being of any specific person, place, or thing...

, even though it appears as syntactically intransitive
Intransitive verb
In grammar, an intransitive verb is a verb that has no object. This differs from a transitive verb, which takes one or more objects. Both classes of verb are related to the concept of the transitivity of a verb....

; in this view, the required it is to be considered a dummy word.

Contrarian views

However, there have been a few objections to this interpretation. Noam Chomsky
Noam Chomsky
Avram Noam Chomsky is an American linguist, philosopher, cognitive scientist, and activist. He is an Institute Professor and Professor in the Department of Linguistics & Philosophy at MIT, where he has worked for over 50 years. Chomsky has been described as the "father of modern linguistics" and...

 has argued that the it employed as the subject of English weather verbs ("weather it", so called because of its predominant use in reference to weather
Weather
Weather is the state of the atmosphere, to the degree that it is hot or cold, wet or dry, calm or stormy, clear or cloudy. Most weather phenomena occur in the troposphere, just below the stratosphere. Weather refers, generally, to day-to-day temperature and precipitation activity, whereas climate...

) can control an adjunct clause, just like a "normal" subject. For example, compare:
She brushes her teeth before having a bath.
→ She brushes her teeth before she has a bath.

It sometimes rains after snowing.
→It sometimes rains after it snows.


If this analysis is accepted, then the "weather it" is to be considered a "quasi-(verb) argument" and not a dummy word.

Some linguists like D.L. Bolinger go even further and claim that the "weather it" simply refers to a general state of affairs in the context of utterance. In this case, it would not be a dummy word at all. Possible evidence for this claim includes exchanges such as:
"Was it nice (out) yesterday?"
"No, it rained."

Raising verbs

Other examples of semantically empty it are found with raising verbs in "unraised" counterparts. For example:
It seems that John loves coffee.   (corresponding "raised" sentence: John seems to love coffee.)

Extraposition

Dummy it can also be found in extraposition constructions in English such as in the following:
It was known to all the class [ that the boy failed his test ].

Dummy objects

In English, dummy object
Object (grammar)
An object in grammar is part of a sentence, and often part of the predicate. It denotes somebody or something involved in the subject's "performance" of the verb. Basically, it is what or whom the verb is acting upon...

 pronouns tend to serve an ad hoc function, applying with less regularity than they do as subjects. Dummy objects are sometimes used to transform transitive
Transitive verb
In syntax, a transitive verb is a verb that requires both a direct subject and one or more objects. The term is used to contrast intransitive verbs, which do not have objects.-Examples:Some examples of sentences with transitive verbs:...

 verbs to transitive
Transitive verb
In syntax, a transitive verb is a verb that requires both a direct subject and one or more objects. The term is used to contrast intransitive verbs, which do not have objects.-Examples:Some examples of sentences with transitive verbs:...

 light verb
Light verb
In linguistics, a light verb is a verb participating in complex predication that has little semantic content of its own, but provides through inflection some details on the event semantics, such as aspect, mood, or tense...

s form, e.g. do → do it, "to engage in sexual intercourse"; make → make it, "to achieve success"; get → get it, "to comprehend". Prepositional objects are similar, e.g. with it, "up to date"; out of it, "dazed" or "not thinking". All of these phrases, of course, can also be taken literally. For instance:
He ordered a cheeseburger, and even though it took them a while to make it, he did get some french fries with it.

Dummy predicates

It has been proposed that elements like expletive there in existential sentences and pro in inverse copular sentences play the role of dummy predicate rather than dummy subject so that the postverbal Noun Phrase would rather be the embedded subject of the sentence
Sentence (linguistics)
In the field of linguistics, a sentence is an expression in natural language, and often defined to indicate a grammatical unit consisting of one or more words that generally bear minimal syntactic relation to the words that precede or follow it...

. See copula and sentence
Sentence (linguistics)
In the field of linguistics, a sentence is an expression in natural language, and often defined to indicate a grammatical unit consisting of one or more words that generally bear minimal syntactic relation to the words that precede or follow it...

.
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