A pro-drop language (from "pronoun-dropping") is a language in which certain classes of pronouns may be omitted when they are in some sense pragmatically inferable (the precise conditions vary from language to language, and can be quite intricate). The phenomenon of "pronoun-dropping" is also commonly referred to in linguistics as zero or null anaphora.
In everyday speech there are often instances when who or what is being referred to can be inferred from context. Proponents of the term "pro-drop" take the view that pronouns which in other languages would have those referents can be omitted, or be phonologically null. Among major languages, two of which might be called a pro-drop language are Japanese and Korean (featuring pronoun deletion not only for subjects, but for practically all grammatical contexts). Chinese, Slavic languages, and American Sign Language also exhibit frequent pro-drop features. Non-pro-drop is rather an areal feature of Standard Average European including French, German, and English.
Some languages might be considered only partially pro-drop in that they allow deletion of the subject pronoun. These null subject languages include most Romance languages, with French being the most notable exception, as well as all the Balto-Slavic languages and to a limited extent Icelandic.
History of the term
The term "pro-drop" stems from Noam Chomsky's "Lectures on Government and Binding" from 1981 as a cluster of properties of which "null subject" was one (for the occurrence of pro as a predicate rather than a subject in sentences with the copula see Moro 1997). According to this parameter, languages like Italian and Spanish may be classified as pro-drop languages, while English and French may not. The exploration of the properties related to the pro-drop was also crucial in identifying the notion of parameter. Empirically, the comparison between English and Italian became very important (cf. Rizzi 1982).
Thus, a one-way correlation was suggested between inflectional agreement (AGR) and empty pronouns on the one hand and between no agreement and overt pronouns, on the other. It is worth noting that in the classical version, languages which not only lack agreement morphology but also allow extensive dropping of pronouns—such as Japanese, Chinese, Korean, and Vietnamese—are not included, as is made clear in a footnote: "The principle suggested is fairly general, but does not apply to such languages as Japanese in which pronouns can be missing much more freely." (Chomsky 1981:284, fn 47).
The term pro-drop is also used in other frameworks in generative grammar, such as in lexical functional grammar (LFG), but in a more general sense: "Pro-drop is a widespread linguistic phenomenon in which, under certain conditions, a structural NP may be unexpressed, giving rise to a pronominal interpretation." (Bresnan 1982:384). For a general history of this term within the development of syntactic theory, see Graffi 2001.
The empty category assumed (under government and binding theory) to be present in the vacant subject position left by pro-dropping is known as pro, or as "little pro" (to distinguish it from "big PRO", an empty category associated with non-finite verb phrases).
Consider the following examples from Japanese:
- Kono kēki wa oishii. Dare ga yaita no?
- This cake TOPIC tasty-PRESENT. Who SUBJECT bake-PAST EXPLAIN.?
- "This cake is tasty. Who baked it?"
- Shiranai. Ki ni itta?
- know-NEGATIVE. like-PAST?
- "I don't know. Did you like it?"
The pronouns in bold in the English translations (it in the first line, I, you, and it in the second) appear nowhere in the Japanese sentences but are understood from context. If nouns or pronouns were supplied, the resulting sentences would be grammatically correct but sound unnatural. (Learners of Japanese as a second language, especially those whose first language is non-pro-drop like English or French, often supply personal pronouns where they are pragmatically inferable, an example of language transfer.)
The above-mentioned examples from Japanese are readily rendered into Chinese:
- Zhè kuài dàngāo hĕn mĕiwèi. Shéi kăo de?
- This piece cake very beautiful taste. Who bakes?
- "This cake is very tasty. Who baked it?"
- Bù zhīdào. Xĭhuan ma?
- Not know. like [QUESTION MARKER ( = not)]?
- "I don't know. Do you like it?"
Though it is worthy to note that unlike Japanese, the inclusion of the dropped pronouns does not make the sentence sound unnatural.
Arabic is considered a null-subject language, as demonstrated by the following example:
- Arabic text: ساعد غيرك، يساعدك
- Transliteration: sā'id ghayrak, yusā'iduk
- Literal translation: help other, helps you.
- Idiomatic translation: You help another, he helps you.
- Gel-diğ-i-ni gördüm.
- Coming see+IMP+1SG.
- I saw you/him/her/it come.
The subject "I" above is easily inferable as the verb gör-mek is declined in the first person simple past tense form. The object pronoun is supposed to be deduced from the context; where context is not clear enough, it should be supplied. For example, if one wants to make it sure that it was the person spoken to who was seen, one would say:
- Senin geldiğini gördüm.
English is considered a non-pro-drop language. Nonetheless, subject pronouns are almost always dropped in imperative sentences (e.g., Come here). In informal speech, pronouns may sometimes be dropped in other types of sentences, together with some other words, especially copulas and auxiliaries:
- [Have you] ever been there?
- [I'm] going to the shops. [Do you] want to come?
- Seen on signs: [I am/We are] out to lunch; [I/we will be] back at 1:00 [P.M].
- What do you think [of it]? – I like [it]! (the latter only in some dialects)
In speech, when pronouns are not dropped, they are more often elided than other words in an utterance.
Relative pronouns are often dropped in short restrictive clauses: That's the man [whom] I saw.
Note that these elisions are generally restricted to very informal speech and certain fixed expressions, and the rules for their use are complex and vary among dialects. A noted instance was the "lived the dream" section of George H. W. Bush's speech at the 1988 Republican National Convention.
Subject pronouns can be often omitted in modern Greek. Example:
- Βλέπεις εκείνο το κούτσουρο; Θα ήταν καλό για τη φωτιά. Είναι τελείως ξερό.
- See that the log? Would be good for the fire. Is completely dried (literal, direct translation)
- (Do) you see this log? It would be good for the fire. It has completely dried. (idiomatic translation)
Another phenomenon commonly encountered in modern Greek is the omission of the preposition and article in phrases denoting place or movement to place.
- I am at home.
- Είμαι σπίτι.
- I'm going home.
- Πάω σπίτι.
- "I'm going [there]!"
Most Romance languages (with the notable exception of French) are often categorised as pro-drop too, most of them only in the case of subject pronouns. Unlike in Japanese, however, the missing subject pronoun is not inferred strictly from pragmatics, but partially indicated by the morphology of the verb. Example:
- ¿Ves este tronco? Sería bueno para la fogata. Completamente seco. (Spanish)
- See this log? Would be good for the campfire. Completely dry (literal, direct translation)
- (Do) you see this log? It would be good for the campfire. It is completely dry (idiomatic translation)
- Estás a ver este tronco? Seria bom para a fogueira. Secou completamente. (European Portuguese)
- Are to see this log? Would be good for the campfire. Dried completely (literal, direct translation)
- (Do) you see this log? It would be good for the campfire. It has completely dried. (idiomatic translation)
- "Tá/Tás" (está/estás) vendo esse tronco? Seria bom prà fogueira. Secou totalmente. (Brazilian Portuguese)
- Are seeing this log? Would be good for-the campfire. Dried totally (literal, direct translation)
- (Do) you see this log? It would be good for the campfire. It has completely dried. (idiomatic translation)
- Vedi questo tronco? Andrebbe bene da bruciare. È completamente secco. (Italian)
- See this log? Would go well for burning. Is completely dry (literal, direct translation)
- Do you see this log? It would be fit for burning. It is completely dry. (idiomatic translation)
In Portuguese object pronouns are often omitted. Once more the context helps. Example: Situation: Maria tries on a dress at a store, comes to her husband and asks:
- – Viu que bonito? Não gosta? Pode comprar? (BP) Viste que bonito? Não gostas? Podes comprar? (EP/BP)
- Saw how beautiful? Don't like? Can buy? Polite-2ndPERS-SING PRESENT-INDICATIVE ? (BP)
- Saw how beautiful? Don't like? Can buy? -2ndPERS-SING PRESENT-INDICATIVE ? (EP)
- Have you seen how beautiful it is? Do you like it? Can you buy it?
From the situation, one can understand that she is talking about the dress.
Spanish and Portuguese are also notable amongst Romance languages because they have no specific pronouns for circumstantial complements (arguments denoting circumstance, consequence, place or manner, modifying the verb but not directly involved in the action) or partitives (words or phrases denoting a quantity of something). Compare the following:
- "I'm going [there]!"
- "I have four of them."
Expletive subjects are dropped in French while they are obligatorily expressed in English:
- Je trouve __ difficile d'atteindre ce but.
- I find it difficult to reach that goal.
All Slavic languages behave in a similar manner to the Romance pro-drop languages. Example:
- Бачу [яго]. Ідзе. Belarusian
- Виждам го. Идва. Bulgarian
- Vidim ga. Prilazi. Croatian
- Vidím ho. Jde. Czech
- Го гледам. Доаѓа. Macedonian
- Widzę go. Idzie. Polish
- Вижу [его]. Идёт. Russian
- Видим га. Долази. Serbian
- Vidím ho. Ide. Slovak
- Vidim ga. Prihaja. Slovene
- Бачу [його]. Йде. Ukrainian
- "I see him. He is coming."
Here he in the second sentence is inferred from context. In the East Slavic languages even the objective pronoun "его" can be omitted in the present and future tenses (both imperfect and perfective). As with the Romance languages mentioned above, the missing pronoun is not inferred strictly from pragmatics, but partially indicated by the morphology of the verb (Вижу, Виждам, Widzę, Vidim, etc...). However, the past tense of both imperfective and perfective in modern East Slavic languages inflects by gender and number rather than the person due to the fact that the present tense conjugations of the copula "to be" (Russian быть, Ukrainian бути, Belorussian быць) have practically fallen out of use. As such, the pronoun is often included in these tenses, especially in writing.
In Finnish, the verb inflection replaces first and second person pronouns in simple sentences, e.g. menen "I go", menette "all of you go". Pronouns are typically left in place only when they need to be inflected, e.g. me "we", meiltä "from us". There are possessive pronouns, but possessive suffixes, e.g. -ni as in kissani "my cat", are also used, as in Kissani söi kalan ("my cat ate a fish"). A peculiarity of colloquial Finnish is that the pronoun me ("we") can be dropped if the verb is placed in the passive voice (e.g. haetaan, standard "it is fetched", colloquial "we fetch"). In the Estonian language, a close relative of Finnish, the tendency is less clear. It generally uses explicit personal pronouns in the literary language, but these are often omitted in colloquial Estonian.
Hungarian is also pro-drop, subject pronouns are used only for emphasis, as example (Én) mentem "I went", and because of the definite conjugation, object pronouns can be often elided as well; for example, the question (Te) láttad a macskát? "Did (you) see the cat?" can be answered with just láttam "(I) saw (it)", because the definite conjugation renders the object pronoun superfluous.
Modern Hebrew, like Biblical Hebrew, is a "moderately" pro-drop language. In general, subject pronouns must be included in the present tense. Since Hebrew has no verb forms expressing the present tense, the present tense is formed using the present participle (somewhat like English I am guarding). The participle in Hebrew, as is the case with other adjectives, declines only in grammatical gender and number (like the past tense in Russian), thus:
- I (m.) guard (ani shomer) = אני שומר
- You (m.) guard (ata shomer) = אתה שומר
- He guards (hu shomer) = הוא שומר
- I (f.) guard (ani shomeret) = אני שומרת
- We (m.) guard (anachnu shomrim) = אנחנו שומרים
Since the participle lacks the distinction between grammatical persons, pronouns must be added in the majority of cases.
In contrast, the past tense and the future tense are composed of "non-degenerate" conjugations – the verb has a different cross-marked form for each grammatical person, and a properly conjugated verb contains all the information about the subject. The subjective pronoun is therefore normally dropped, except in third-person.
- I (m./f.) guarded (shamarti) = שמרתי
- You (m. pl.) guarded (sh'martem) = שמרתם
- I (m./f.) will guard (eshmor) = אשמור
- You (pl./m.) will guard (tishm'ru) = תשמרו
Many nouns can take suffixes to reflect the possessor, in which case the personal pronoun is dropped. In daily modern Hebrew usage, inflection of nouns is common only for simple nouns, and in most cases, inflected possessive pronouns are used. In Hebrew, possessive pronouns are treated mostly like adjectives and follow the nouns which they modify. In biblical Hebrew, inflection of more sophisticated nouns is more common than in modern usage.
Generalizations across languages
Spanish, Italian, Catalan, Occitan and Romanian can elide subject pronouns only (Portuguese sometimes elides object pronouns as well), and they often do so even when the referent has not been mentioned. This is helped by person/number inflection on the verb. It has been observed that pro-drop languages are those with either rich inflection for person and number (Persian, Polish, Portuguese, etc.) or no such inflection at all (Japanese, Chinese, etc.), but languages that are intermediate (English, French, etc.) are non-pro-drop.
While the mechanism by which overt pronouns are more "useful" in English than in Japanese is obscure, and there are exceptions to this observation, it still seems to have considerable descriptive validity. As Huang puts it, "Pro-drop is licensed to occur either where a language has full agreement, or where a language has no agreement, but not where a language has impoverished partial agreement."
Other language families and linguistic regions
Among the Indo-European and Dravidian languages of India, pro-drop is the general rule though many Dravidian languages do not have overt verbal markers to indicate pronominal subjects. Mongolic languages are similar in this respect to Dravidian languages, and all Paleosiberian languages are rigidly pro-drop.
Outside of northern Europe, most Niger–Congo languages, Khoisan languages of Southern Africa and Austronesian languages of the Western Pacific, pro-drop is the usual pattern in almost all linguistic regions of the world. In many non-pro-drop Niger–Congo or Austronesian languages, like Igbo, Samoan and Fijian, however, subject pronouns do not occur in the same position as a nominal subject and are obligatory, even when the latter is present. In more easterly Austronesian languages, like Rapa Nui and Hawaiian, subject pronouns are often omitted even though no other subject morphemes exist. Pama–Nyungan languages of Australia also typically omit subject pronouns even when there is no explicit expression of the subject.
Many Pama–Nyungan languages, however, have clitics, which often attach to nonverbal hosts to express subjects. The other languages of Northwestern Australia are all pro-drop, for all classes of pronoun. Also, Papuan languages of New Guinea and Nilo-Saharan languages of East Africa are pro-drop.
Among the indigenous languages of the Americas, pro-drop is almost universal, as would be expected from the generally polysynthetic and head-marking character of the languages. That generally allows eliding of all object pronouns as well as subject ones. Indeed, most reports on Native American languages show that even emphatic use of pronouns exceptionally rare. Only a few Native American languages, mostly language isolates (Haida, Trumai, Wappo) and the Oto-Manguean family are known for normally using subject pronouns.
Classical Chinese exhibits extensive dropping not only pronouns but also any terms (subjects, verbs, objects, etc.) pragmatically inferable, giving a very compact character to the language. Note, however, that Classical Chinese was a written language, and such word dropping is not necessarily representative of the spoken language or even of the same linguistic phenomenon.
- Kordić, Snježana (2001). Wörter im Grenzbereich von Lexikon und Grammatik im Serbokroatischen [Serbo-Croatian Words on the Border Between Lexicon and Grammar]. Studies in Slavic Linguistics ; 18 (in German). Munich: Lincom Europa. pp. 10–12. ISBN 3-89586-954-6. LCCN 2005530313. OCLC 47905097. OL 2863539W. Summary.
- Martin Haspelmath, The European linguistic area: Standard Average European, in Martin Haspelmath, et al., Language Typology and Language Universals, vol. 2, 2001, pp. 1492-1510
- R.L. Trask, A Dictionary of Grammatical Terms in Linguistics, Routledge 2013, p. 218.
- Bush, George W. (18 August 1988). "Address Accepting the Presidential Nomination at the Republican National Convention in New Orleans". American Presidency Project. University of California, Santa Barbara. Retrieved 22 July 2015.
Those were exciting days. Lived in a little shotgun house, one room for the three of us. Worked in the oil business, started my own. In time we had six children. Moved from the shotgun to a duplex apartment to a house. Lived the dream - high school football on Friday night, Little League, neighborhood barbecue.
- Didion, Joan (27 October 1988). "Insider Baseball". The New York Review of Books. Retrieved 22 July 2015.
as Bush, or Peggy Noonan, had put it in the celebrated no-subject-pronoun cadences of the "lived the dream" acceptance speech.
- Greenfield, Jeff (September 2008). "Accepting the Inevitable: What McCain can learn from the acceptance speeches of Reagan, Bush, and Gore". Slate: 2.
Note how, as he tells his story, the pronouns drop out, underscoring the idea that this was more a conversation than a speech
- Winant, Gabriel (21 December 2006). "When the Going Gets Tough". Leland Quarterly. Retrieved 23 July 2015.
Bush projects an image as a forthright Westerner who has no truck with fancy language or personal pronouns.
- Huang, C.-T. James. "On the distribution and reference of empty pronouns". Linguistic Inquiry 15: 531-574. 1984.
- Bresnan, Joan (ed.) (1982) The Mental Representation of Grammatical Relations, MIT Press, Cambridge, Massachusetts.
- Chomsky, Noam (1981) Lectures on Government and Binding: The Pisa Lectures. Holland: Foris Publications. Reprint. 7th Edition. Berlin and New York: Mouton de Gruyter, 1993.
- Graffi, Giorgio (2001) 200 Years of Syntax. A critical survey, John Benjamins, Amsterdam, The Netherlands.
- Moro, Andrea (1997) The raising of predicates. Predicative noun phrases and the theory of clause structure, Cambridge Studies in Linguistics, Cambridge University Press, Cambridge, England.
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- Krivochen, Diego and Peter Kosta (2013) Eliminating Empty Categories. Frankfurt am Main: Peter Lang.
- Jaeggli, Osvaldo, and Ken Safir (1989) The Null Subject Parameter. Dordrecht: Kluwer.
- List of languages including pro-drop (PD) or non-pro-drop (NPD) status.