Nominal Sentence — a sentence whose predicate is a noun or noun phrase rather than a verb — common in Japanese (AはBです), Arabic, and other languages where copulas may be optional or absent.

Definition

A sentence whose predicate is a noun or noun phrase rather than a verb — common in Japanese (AはBです), Arabic, and other languages where copulas may be optional or absent.

In Depth

A sentence whose predicate is a noun or noun phrase rather than a verb — common in Japanese (AはBです), Arabic, and other languages where copulas may be optional or absent.

In-Depth Explanation

A nominal sentence is a sentence whose predicate consists of a noun phrase rather than a verb — a copular structure where the relationship between subject and predicate is expressed without an explicit verb or by a linking/copulative verb (to be equivalent). Nominal sentences are a fundamental grammatical feature in Japanese and several other typologically important languages.

Core concept:

In English, a predicate almost always requires a verb (He is a teacher; This is expensive). In languages with nominal sentences, the bare noun phrase can function as the predicate directly, or the copula may be optional:

The Japanese copula system:

Japanese is copula-prominent — nominal sentences require the copula in most formal registers, but the copula takes different forms depending on register:

• です (desu): polite/formal
• だ (da): plain/informal (restricted in certain social contexts)
• である (de aru): formal written/literary
• ございます (gozaimasu): very formal/humble
• Ø (zero copula): informal conversation; also in nominal predicate constructions where meaning is inferrable

Copula conjugation in Japanese: Unlike many languages, the Japanese copula also carries tense:

• Present: です / だ
• Past: でした / だった
• Negative: ではありません / じゃない
• Conditional: なら
• Conjunctive: で

Distinction from noun-modified predicates: A nominal sentence predicate is the noun itself, not a noun-modified construct. Note the difference between a pure nominal predicate (She is a teacher) and a verb phrase with noun object (She teaches).

History

Nominal sentence typology has been studied in structural linguistics since the mid-20th century. Cross-linguistic analysis by Stassen (1997) in Intransitive Predication systematically examined copular and copula-less nominal predicates across world languages. The zero-copula phenomenon (absence in present tense, as in Russian, Arabic, Hebrew) versus obligatory copula languages (like English) has been an important dataset for universals research. For Japanese specifically, the historical development of the copula system from classical nari and なり/に+あり compounds through modern だ/です is documented in Japanese historical linguistics.

Common Misconceptions

• “Japanese sentences don’t need verbs.” While nominal sentences are common in Japanese, the broader claim is misleading. Japanese is a verb-final language where full sentences (especially in formal writing) typically have verbal predicates. Nominal sentences are one of several predicate types.
• “The copula だ/です is just a politeness marker.” The copula carries grammatical load beyond politeness — it marks tense, modality (in the copula’s various forms), and is required syntactically in many contexts. Confusing it with a purely politeness particle leads to systematic grammar errors.
• “Arabic and Russian work the same way.” Both Arabic and Russian use zero-copula in certain tenses (Arabic: present; Russian: present tense in declaratives), but the conditions governing copula presence differ from each other and from Japanese.

Social Media Sentiment

Nominal sentences appear in Japanese grammar explanation content, particularly for learners who have studied other European languages first and find the copula variable behaviour unexpected. The distinction between だ and です registers is a very frequent beginner discussion topic.

Last updated: 2026-04

Practical Application

• だ versus です register control: Native Japanese speakers are sensitive to the social implications of plain だ vs. polite です — using plain form with strangers or superiors is a register violation. Learners should default to です/ます forms until contextually appropriate familiarity is established.
• Noun predicate identification in reading: In Japanese, when a sentence ends in a noun followed by だ/です, it is a nominal sentence. This pattern also governs relative clause formation — understanding nominal sentences helps with understanding Japanese sentence-final modifying structures (〜ということだ, 〜はずだ, 〜らしい, etc.).
• な-adjectives: Japanese な-adjectives (e.g., 静かだ — shizuka da, “is quiet”) function grammatically as nominal predicates in combination with the copula — understanding nominal sentences is essential for the な-adjective system.
• Comparison with English: Japanese learners of English sometimes underuse verb forms in English because nominal sentences function naturally in their L1 — awareness of this asymmetry can help target-language-specific correction.

Related Terms

• Copula
• Predicate
• Japanese Sentence Structure
• Keigo

See Also

Sakubo – Japanese SRS App

Sources

• Stassen, L. (1997). Intransitive Predication. Oxford University Press. Typological cross-linguistic study of predication types including nominal sentence patterns across world’s languages.
• Noda, H. (1991). Copula sentences in Japanese. In Issues in Japanese Linguistics. Mouton de Gruyter. Structural analysis of the Japanese copula and nominal predicate constructions.
• Shibatani, M. (1990). The Languages of Japan. Cambridge University Press. Grammatical overview of Japanese including the copula system and sentence-final predicate types.