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Topic and comment

Terms describing sentence structure in linguistics

In linguistics, a sentence is divided into a topic (what is being talked about) and a comment or focus (what is said about the topic), together forming the information structure. The topic differs from the grammatical subject, as the former is based on pragmatic context while the latter is defined syntactically. For example, in "As for the little girl, the dog bit her," the topic is "the little girl" but the subject is "the dog." Additionally, the notion of agent, or "doer," relates to semantics. Some languages, like Korean and Japanese, are topic-prominent languages, where word order depends largely on topic–comment structure.

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Definitions and examples

The sentence- or clause-level "topic", or "theme", can be defined in a number of different ways. Among the most common are

the phrase in a clause that the rest of the clause is understood to be about,
a special position in a clause (often at the right or left-edge of the clause) where topics typically appear.

In an ordinary English clause, the subject is normally the same as the topic/theme (example 1), even in the passive voice (where the subject is a patient, not an agent: example 2):

The dog bit the little girl.
The little girl was bitten by the dog.

These clauses have different topics: the first is about the dog, and the second about the little girl.

In English it is also possible to use other sentence structures to show the topic of the sentence, as in the following:

As for the little girl, the dog bit her.
It was the little girl that the dog bit.

The case of expletives is sometimes rather complex. Consider sentences with expletives (meaningless subjects), like:

It is raining.
There is some room in this house.
There are two days in the year in which the day and the night are equal in length.

In these examples the syntactic subject position (to the left of the verb) is manned by the meaningless expletive ("it" or "there"), whose sole purpose is satisfying the extended projection principle, and is nevertheless necessary. In these sentences the topic is never the subject, but is determined pragmatically. In all these cases, the whole sentence refers to the comment part.¹

The relation between topic (theme) and comment (rheme, focus) should not be confused with the topic–comment relation in the Rhetorical Structure Theory Discourse Treebank (RST-DT) corpus where it is defined as "a general statement or topic of discussion is introduced, after which a specific remark is made on the statement or topic". For example: "[As far as the pound goes,] [some traders say a slide toward support at 1.5500 may be a favorable development for the dollar this week.]"² ³

Realization of topic–comment

Different languages mark topics in different ways. Distinct intonation and word-order are the most common means. The tendency to place topicalized constituents sentence-initially ("topic fronting") is widespread. Topic fronting refers to placing the topic at the beginning of a clause regardless of whether it is marked or not.⁴ Again, linguists disagree on many details.

Languages often show different kinds of grammar for sentences that introduce new topics and those that continue discussing previously established topics.

When a sentence continues discussing a previously established topic, it is likely to use pronouns to refer to the topic. Such topics tend to be subjects. In many languages, pronouns referring to previously established topics will show pro-drop.

In English

In English the topic, or theme, comes first in the clause, and is typically marked out by intonation as well.⁵

English is quite capable of using a topic-prominent formulation instead of a subject-prominent formulation when context makes it desirable for one reason or another. A typical pattern for doing so is opening with a class of prepositions such as: as for, as regards, regarding, concerning, respecting, on, re, and others. Pedagogically or expositorily this approach has value especially when the speaker knows that they need to lead the listener's attention from one topic to another in a deftly efficient manner, sometimes actively avoiding misplacement of the focus of attention from moment to moment. But whereas topic-prominent languages might use this approach by default or obligately, in subject-prominent ones such as English it is merely an option that often is not invoked.

In other languages

In Japanese and Korean, the topic is usually marked with a postposition such as -wa (は) or 는/은, -(n)eun respectively, which comes after the noun or phrase that is being topicalized.
In Côte d'Ivoire French, the topic is marked by the postposition "là". The topic can be, but is not necessarily a noun or a nominal group, for example: « Voiture-là est jolie deh » ("That car is pretty"); « Aujourd'hui-là il fait chaud » ("It's hot on that day"); « Pour toi-là n'est pas comme pour moi hein » ("For you it's not the same as for me, huh"); and « Nous qui sommes ici-là, on attend ça seulement » ("We who are here, we are waiting for that only").
So-called free word order languages such as Russian, Czech, and to some certain extent Chinese and German, use word order as the primary means, and the topic usually precedes the focus. For example, in some Slavic languages such as Czech and Russian, both orders are possible. The order with the comment sentence-initial is referred to as subjective (Vilém Mathesius invented the term and opposed it to objective) and expresses certain emotional involvement. The two orders are distinguished by intonation.
In Modern Hebrew, a topic may follow its comment in informal speech. For example, the syntactic subject of this sentence is an expletive זה ("ze", lit. "this"):

זה

this

מענין

meʿanyen

interesting

מאד

meʾod,

very,

הספר

ha-sefer

book

הזה

ha-ze

this

זה מענין מאד הספר הזה

ze meʿanyen meʾod, ha-sefer ha-ze

this interesting very, book this

"This book is very interesting."

In American Sign Language, a topic can be declared at the beginning of a sentence (indicated by raised eyebrows and head tilt) describing the referent, and the rest of the sentence describes what happens to that referent.

Practical applications

The main application of the topic-comment structure is in the domain of speech technology, especially the design of embodied conversational agents (intonational focus assignment, relation between information structure and posture and gesture).⁶ There were some attempts to apply the theory of topic/comment for information retrieval⁷ and automatic summarization.⁸

History

The distinction between subject and topic was probably first suggested by Henri Weil in 1844.⁹ He established the connection between information structure and word order. Georg von der Gabelentz distinguished psychological subject (roughly topic) and psychological object (roughly focus). In the Prague school, the dichotomy, termed topic–focus articulation, has been studied mainly by Vilém Mathesius,¹⁰ Jan Firbas, František Daneš, Petr Sgall and Eva Hajičová. They have been concerned mainly by its relation to intonation and word-order. Mathesius also pointed out that the topic does not provide new information but connects the sentence to the context. The work of Michael Halliday in the 1960s is responsible for developing linguistic science through his systemic functional linguistics model for English.¹¹

External links

SFG page: theme – an explanation, for beginners, of theme in systemic functional grammar by Alvin Leong
Iliev, Iv. The Russian Genitive of Negation and Its Japanese Counterpart. International Journal of Russian Studies. 1, 2018

References

Michael Gotze, Stephanie Dipper, and Stavros Skopeteas. 2007. Information Structure in Cross-Linguistic Corpora: Annotation Guidelines for Phonology, Morphology, Syntax, Semantics, and Information Structure. Interdisciplinary Studies on Information Structure (ISIS), Working papers of the SFB 632, Vol. 7. ↩
L. Carlson and D. Marcu, “Discourse tagging reference manual,” ISI Technical Report ISI-TR-545, vol. 54, 2001. ↩
L. Ermakova and J. Mothe. 2016. Document re-ranking based on topic-comment structure. In X IEEE International Conference RCIS, Grenoble, France, June 1–3, 2016. 1–10. ↩
D. Bring, Topic and Comment. Cambridge University Press, 2011, three entries for: Patrick Colm Hogan (ed.) The Cambridge Encyclopedia of the Language Sciences. Cambridge: Cambridge University Press. ↩
MAK Halliday (1994). An introduction to functional grammar, 2nd ed., Hodder Arnold: London, p. 37 ↩
Cassell, Justine, ed. Embodied conversational agents. MIT press, 2000. ↩
A. Bouchachia and R. Mittermeir, “A neural cascade architecture for document retrieval,” in Neural Networks, 2003. Proceedings of the International Joint Conference on, vol. 3. IEEE, 2003, pp. 1915–1920. ↩
L. Ermakova, J. Mothe, A. Firsov. A Metric for Sentence Ordering Assessment Based on Topic-Comment. Structure, in ACM SIGIR, Tokyo, Japan, 07/08/2017-11/08/2017 ↩
H. Weil, De l’ordre des mots dans les langues anciennes compares aux langues modernes: question de grammaire gnrale. Joubert, 1844. ↩
V. Mathesius and J. Vachek, A Functional Analysis of Present Day English on a General Linguistic Basis, ser. Janua linguarum : Series practica / Ianua linguarum / Series practica. Mouton, 1975. ↩
M. A. K. Halliday, An Introduction to Functional Grammar, 2nd ed. London: Arnold, 1994. ↩

Definitions and examples

Realization of topic–comment

In English

In other languages

Practical applications

History

See also

Further reading

External links

References