How Languages Encode Subjects and Objects: A Typological Overview

Morphosyntactic alignment refers to how languages grammatically distinguish between the three possible roles nouns can play in a sentence: the subject/patient (absolutive), the agent (ergative), and the subject of intransitive verbs. Languages classify into several alignment types: Nominative-Accusative (treating subject/agent the same, patient differently—used by English), Ergative-Absolutive (treating subject/patient the same, agent differently—as in Basque), Split Ergativity (using different alignments based on tense or animacy hierarchy), Active-Stative/Split Intransitive (treating subjects differently based on whether they act as agents or patients), Tripartite (treating all three roles distinctly—rare), Neutral (making no distinction—rare), Transitive-Intransitive (treating subject separately from agent/patient—very rare), Direct-Inverse (marking based on animacy hierarchy relative positions—as in Navajo), and Austronesian Alignment (marking verbs with prefixes/suffixes to emphasize different elements).

The active-stative system distinguishes between agentive subjects (with control over the action) and non-agentive subjects (affected without control). This system is found in some Australian languages. The tripartite system marks the subject of transitive verbs, the subject of intransitive verbs, and the object of transitive verbs differently. Intransitive verbs can be divided into agentive (like 'sonreír' - to smile) and non-agentive (like 'crecer' - to grow). The active-stative system distinguishes between voluntary and involuntary actions.

Austronesian Alignment, also known as the Austronesian Focus System or Philippine-type voice system, is a grammatical feature found in languages of Taiwan, the Philippines, parts of Borneo, Sumba, and Madagascar, where every noun phrase in a sentence can be dynamically upgraded or downgraded based on conversational importance, causing corresponding changes in the verb form and noun particles; for example, in Tagalog, the verb changes from 'bumili' (focus on the buyer) to 'binili' (focus on the object) to 'nabili' (focus on the location) to 'ibinili' (focus on the recipient) to 'ginamit' (focus on the instrument), with upgraded nouns marked by 'ang' and downgraded nouns marked by different particles like 'n', 'sa', or 'para sa'.

The ergative-absolutive system is a different type of case alignment where the object of transitive verbs and the subject of intransitive verbs are marked the same way (absolutive case), while the subject of transitive verbs is marked differently (ergative case). This system is found in languages like Basque, Georgian, and some Australian languages. The active-stative system distinguishes between agents (volitional actors) and patients (non-volitional recipients), found in some Australian languages. The tripartite system, found in Dyirbal, marks the subject of intransitive verbs, the subject of transitive verbs, and the object of transitive verbs all differently. The speaker explains that the nominative-accusative system is the most common (55% of languages), while the ergative-absolutive system is the second most common.

Tongan allows both VSO and VOS orders in transitive clauses, while Nuan only allows VSO. This difference stems from whether the absolutive argument moves to receive case from T. In Tongan, the object can be pronounced in either its base position (VSO) or case position (VOS). Coordination data further reveal this distinction: connectives that include T enable case-matching in coordination gaps (Tongan), while those that don't force subject-matching (Nuan). This occurs because when the coordinate phrase includes T, the absolutive argument moves into TP's specifier, creating case-matching constraints. When it doesn't, the ergative argument moves, creating subject-matching constraints.

In syntactically accusative languages, only nominative arguments (subjects and agents) can act as pivot arguments during coordination, while accusative patients cannot; however, the passive voice can convert an accusative patient into a nominative subject, thereby enabling it to function as a pivot. Conversely, in syntactically ergative languages, only absolutive arguments (subjects and patients) can act as pivot arguments, while ergative agents cannot; however, the antipassive voice can convert an ergative agent into an absolutive subject, thereby enabling it to function as a pivot. This demonstrates how syntactic alignment fundamentally shapes which arguments can participate in coordination processes, and how voice systems provide mechanisms to circumvent these alignment-based restrictions.

Two primary alignment systems exist: Nominative-Accusative (treating subject/agent identically, patient distinctly—used by English through word order) and Ergative-Absolutive (treating subject/patient identically, agent distinctly—as in Basque). Split ergativity occurs when languages use different alignments based on tense or animacy hierarchy. Active-stative alignment varies marking based on whether subjects act like agents or patients. Tripartite alignment treats all three roles distinctly but is rare due to complexity.

Coordination can occur within subordinate structures. In the example 'Que as informações sejam divulgadas e não permaneçam circulando em um grupo fechado', the conjunction 'e' coordinates two clauses within a subordinate structure introduced by 'que'. This creates a complex structure where coordination and subordination coexist.

Differential object marking is a phenomenon where the semantic properties of a direct object determine some aspect of its marking, usually relating to animacy or definiteness. In Turkish and Amharic, the direct object is only marked with the accusative if it's definite, otherwise the nominative is used. In Malayalam, the accusative marker only goes on animate nouns. This shows how case marking interacts with semantic features of noun phrases.

Some Italian regional varieties (especially central and southern dialects) use differential object marking with the preposition 'a' for certain objects. For example, 'Ho visto a Maria' (I saw Maria) uses 'a' for human, definite objects, while 'Ho visto un film' (I saw a film) does not. This pattern is also found in Spanish and Sardinian. The marking correlates with semantic traits like animacy and definiteness, and is a legitimate grammatical strategy, not an error.

Differential object marking is a grammatical feature where the case assigned to a direct object depends on semantic properties of the object, most commonly animacy. In many languages, inanimate direct objects remain unmarked (in their unmarked case, usually nominative), while animate direct objects take an accusative marker. This is seen in Turkish, Amharic, and Hebrew. The creator applied this to their conlang, where inanimate nouns never take the accusative case marker because they are recoverable from context, while animate nouns require it. This system simplifies grammar by reducing case markers needed for inanimate nouns.

Direct object marking depends on individuation properties: definiteness, specificity, and animacy. In Turkish and Hebrew, accusative case marks definite or specific direct objects while indefinite objects remain unmarked. In Spanish, direct objects take special marking when high in animacy or definiteness. In Chukchi, low-definiteness objects incorporate into the verb rather than appearing as independent phrases, losing case marking and triggering intransitive agreement. The definiteness of objects affects event telicity, which in turn affects case marking patterns. This demonstrates that case marking encodes referential and semantic properties of arguments beyond their syntactic roles.

Purépecha exhibits Differential Object Marking (DOM) with nominative-accusative alignment. The suffix 'ni' marks objects of monotransitive and ditransitive verbs. Two DOM patterns exist: (1) Extinct type where intrinsic properties trigger marking (human referents, demonstratives, plural inflection); (2) Fluid type where the same noun phrase may or may not receive marking based on context. The language lacks articles, making case marking crucial for definiteness encoding. Case marking with 'ni' functions as a resource for encoding definiteness, delimiting the set of possible referents. This resource can be omitted when interpretation can be established from linguistic and extralinguistic information. Bare nouns with non-human referents and absence of case marking typically present indefinite readings. Indefinite noun phrases with 'ma' exhibit fluid case alternation: absence of 'ni' yields non-specific readings, while presence yields specific, partitive, or partitive specific readings. Case marking is not required for specific or partitive interpretations when relative clauses or contextual information delimit reference. The partitive specific reading can be inferred from situational context, shared knowledge, and textual information. Case marking with 'ni' occurs with bare nouns having inanimate referents and definite readings, but can be omitted when the referent can be unequivocally recognized. The definite reading can be established through relative clauses, contextual inference, or when the referent is already active in the discourse. This demonstrates that definiteness encoding involves an interaction between grammatical marking and contextual factors.

Basque is an ergative-absolutive language that divides sentences differently from anything in the Indo-European family. In Basque, the noun changes its form depending on whether the action it performs affects something else, with the ergative case marker (a hard K sound) having no equivalent in any surrounding language. This is not a quirk but a structural fossil. Basque is also agglutinative, building meaning by stacking suffixes onto root words rather than using separate words. The vocabulary is full of Latin borrowings, but the skeleton never did. The entire architecture of the language operates on a logic that has no Indo-European equivalent.

The Iberian inscriptions are an eloquent counter-example of typological argument weakness, as no words with 'm' or 'p' are documented, while there are 2 sibilants and 2 vibrants, a system totally similar to standard proto-Basque. Although dorsal sibilants in final position could be explained as laminalization behind sonant, minimal pairs like 'h' (breath) and 'gats' (pale) without sonant evidence in the coda require reconstructing two proto-phonemes. Blevins is aware that typological parallels are not determinative in genetic comparison, so she strives to find internal cognates. The grave problem resides in recognition of such comparisons as cognates, where they are not loans. She segments 'por poco' as 'perdón' (sorry), but this is more justified against 'parte trasera' and 'bien' than against 'es sur' from 'sur' of a proto 'hacks' 'tours' not independently justified.

This section explores languages with minimal linguistic relatives, each developing unique solutions. Icelandic preserves ancient Norse heritage with archaic sounds like voiceless N and double L, plus four noun cases, strong/weak conjugations, and middle voice indicating events without agents. Basque, a language isolate with no known relatives, uses ergative-absolutive alignment where subjects change form based on action participation, plus 14 noun cases and powerful auxiliary verbs encoding multiple relationships. Georgian, a Caucasian language, features a distinctive cursive alphabet with rare click consonants and poly-personal verbs encoding information about two people simultaneously. Navajo, an Athabaskan language, presents extreme challenges with 33 consonants and 12 vowels, noun ranking hierarchies affecting word order, and handling verbs categorizing objects by shape, size, and container type. Each demonstrates how geographic and historical isolation led to unique grammatical developments.

Basque verb conjugation is exceptionally complex, changing based on mood, tense, person, number of subject, direct object, and indirect object. Complete conjugation is used only for about a dozen basic verbs like 'to be' and 'to go.' Most verbs are conjugated as compound words with only three forms: perfect, imperfect, and future. Despite being surrounded by Indo-European languages, Basque has resisted influence remarkably well, though Romance loanwords are common. The language uses a vigesimal (base-20) counting system, so 91 is expressed as 4 times 20 plus 11. The word for 'person' in Basque is 'euskaldun,' literally meaning 'Basque speaker.'

Basque (Euskara) is a language isolate spoken in the Basque Country spanning northern Spain and southwestern France, with fewer than one million native speakers; it is considered one of Europe's few surviving pre-Indo-European languages, likely descending from the language of the Aquitanian tribe, and features a unique agglutinative grammar with an ergative-absolutive case system where intransitive subjects use the absolutive case while transitive subjects use the ergative case, along with a distinctive vigesimal (base-20) number system and a unified standard form called Batua established in 1968 to preserve the language after decades of suppression under Francisco Franco's dictatorship.