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A 'dummy pronoun' (formally: 'expletive pronoun' or 'pleonastic pronoun') is a type of pronoun used in non-pro-drop languages, such as English.
It is used when a particular verb argument (or preposition) is ''nonexistent, unknown, irrelevant, already understood,'' or otherwise ''not to be spoken of directly'', but when a reference to the argument (a pronoun) is nevertheless syntactically required—ie. when there is increasing ambiguity between the pronoun and the subject or object.
For instance, in the phrase, ''It is obvious that the violence will continue'', ''it'' is a dummy pronoun, not referring to any agent. Unlike a regular pronoun of English, it cannot be replaced by any noun phrase.

Contents

The "weather ''it''"

Contrarian views

Dummy objects

Dummy predicates

References

The "weather ''it''"

In the phrase ''It is raining'', the verb ''to rain'' is usually considered semantically impersonal, even though it appears as syntactically intransitive; 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 has argued that the ''it'' employed as the subject of English weather verbs ("weather ''it''", called so due to their predominant use in reference to weather) 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."''

Dummy objects

In English, dummy object pronouns tend to serve an ad hoc function, applying with less regularity than they do as subjects. Dummy objects are sometimes used to transform intransitive verbs to transitive light verbs from , 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'' (now old fashioned), "up to date"; ''out of it'', "unconscious". 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 sentence play the role of dummy predicates rather than dummy subject so that the postverbal Noun Phrase would rather be the embedded subject of the sentence. See copula and sentence.

References

★ Everaert, M. - van Riemsdijk, H - Goedemans, R. (eds) 2006 The Blackwell Companion to Syntax, Volumes I-V, Blackwell, London: see "existential sentences and expletive there" in Volume II.

★ Chomsky, Noam (1981) Lectures on Government and Binding. Dordrecht: Foris., cited in http://www.ling.helsinki.fi/sky/julkaisut/SKY2004/Alba-Salas.pdf.

★ Bolinger, D. L. (1977). Meaning and form. English Language Series, 11. London: Longman.

★ Graffi, G. 2001 200 Years of Syntax. A critical survey, John Benjamins, Amsterdam, The Netherlands.

★ Moro, A. 1997 The raising of predicates. Predicative noun phrases and the theory of clause structure, Cambridge Studies in Linguistics, Cambridge University Press, Cambridge, England.