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Active voice is the grammatical voice of constructions such as The technician opened the valve, where the actor is expressed as subject. It contrasts with a corresponding passive voice construction, The valve was opened by the technician, in which that participant is expressed differently.^[ref]

The contrast holds the described event fixed while changing grammatical organization. In the first example, the valve is the object; in the second, it occupies the subject position. The actor's presence in a by-phrase does not make that phrase the subject.

Separating voice from other features avoids a common classification error. The technician did not open the valve remains active even though it denies that an opening occurred. Likewise, changing opened to opens can change grammatical tense without changing grammatical voice. A grammatical analysis should identify the construction and its participant relationships, rather than infer voice from whether the sentence sounds energetic or describes a completed action.

Grammatical voice concerns how a construction relates an event's participants to grammatical positions such as subject and object. Active voice and passive voice provide a familiar contrast, but the categories recognized across languages are not limited to that pair.^[ref]

In The mechanic repairs the pump, the mechanic is the subject. In The pump is repaired by the mechanic, the pump occupies that relation while the mechanic is expressed differently. Both can describe the same repair. Changing is repaired to was repaired instead changes grammatical tense while retaining passive voice.

A structural account can therefore hold the participants and event approximately fixed while varying their expression. Separating grammatical voice, grammatical tense and thematic roles prevents a parser or an experiment from treating those dimensions as interchangeable. It also makes the claimed invariants and changes in a comparison explicit.

Linguistic typology compares structural properties across languages using explicit criteria for grouping constructions. It can ask which patterns recur, which combinations are rare, and whether a proposed generalization survives a wider sample. The World Atlas of Language Structures exemplifies this approach by coding documented properties as comparable features.^[ref]

Consider word order. Three distinct elements have $3!=6$ possible permutations, but logical possibility alone says nothing about their distribution in languages. A published comparison must define which constructions count: the atlas's chapter on subject, object and verb order restricts its main comparison to specified transitive declarative constructions.^[ref]

For an original counting example, a sample containing six languages of one type and four of another gives proportions $0.6$ and $0.4$. Those proportions describe that sample. Sampling bias, missing observations and shared historical relationships can prevent them from estimating how common the types are more generally. An unrecorded feature must also remain distinct from an observed absence.

Matthew S. Dryer is a linguist whose research combines linguistic typology, syntax and language documentation. His work has developed cross-language comparisons of word order and related structural properties, and he coedited the World Atlas of Language Structures.^[ref]

His atlas chapter on the order of subject, object and verb makes the comparison operational. It specifies the constructions considered and defines the participant labels for that purpose, rather than assuming that every grammatical framework uses the labels identically.^[ref]

This illustrates a central measurement problem in comparative research. Counting languages under a label is reproducible only if another researcher can determine which documented constructions satisfy it. Missing data, a different construction type or a changed coding rule can alter a count without representing a historical change in the language itself. Linking each observation to its definition and evidence lets a lexical database or grammatical dataset support testable comparisons.

An object is a grammatical relation assigned to certain complements of a verb. In a typical active construction it identifies a core participant other than the subject, often an entity affected by the event. This is a grammatical classification rather than a requirement that the referent be a physical object.^[ref]

In Mira opened the gate, the gate is an object. In The gate was opened by Mira, the same participant is instead the subject of a passive voice construction. The event can remain closely related while the grammatical relationships change.

An explicit annotation scheme also needs boundaries among complements. Universal Dependencies distinguishes obj from iobj and from other dependent relations; a traditional label “object” does not automatically determine the appropriate code. This makes syntactic dependency criteria part of the analysis needed to compare annotated text corpus resources.

Passive voice is a grammatical construction that changes how an event's participants are expressed, typically placing an affected participant in the subject relation while omitting the actor or expressing it differently. It belongs to grammatical voice, not simply to a choice of slow or indirect wording.^[ref]

Compare The mechanic repaired the pump with The pump was repaired by the mechanic. Both can describe the same repair, but the pump changes from object to subject; the mechanic is expressed in a separate phrase. Omitting that phrase gives The pump was repaired without specifying who performed the repair.

This is useful for separating thematic roles from grammatical relationships. A representation that treats every subject as the actor will misdescribe the passive example. The Universal Dependencies label nsubj:pass preserves subject status while recording the passive construction, making the analysis inspectable in a text corpus.

A verb is a part of speech that commonly organizes a clause, specifying relationships among its participants and contributing an event or state description. Forms of a verb may express grammatical tense, grammatical aspect or grammatical agreement, though the mechanisms differ across languages.^[ref]

Compare Rin sleeps with Rin opens the box. The second construction contains an object in addition to its subject; knowing a verb includes knowing how it combines with other expressions. Calling verbs “action words” misses examples such as know, which describes a state.

An annotation scheme must also define its boundaries. Universal Dependencies assigns main verbs the label VERB while distinguishing auxiliary uses with AUX. Thus a traditional grammatical description and a particular computational tag inventory need not draw every boundary identically. Stating the scheme makes category counts in a text corpus interpretable.

Word order concerns the linear arrangement of linguistic elements. A basic clause-order description commonly records the relative positions of the subject, verb and object in an ordinary declarative clause. Such a description summarizes one construction type; it does not specify every ordering permitted by a language.^[ref]

In the original example Mira follows Noor, the English subject-verb-object arrangement identifies who follows whom. Noor follows Mira uses the same words with the participants reversed. A toy subject-object-verb grammar could instead express the first relation as Mira Noor follows. Here ordering and the participants' thematic roles are separate analytical dimensions. Comparing ordinary clauses with questions or embedded clauses helps determine whether a proposed pattern generalizes. Comparative syntax investigates those relationships across languages.

The World Atlas of Language Structures is a structured collection of documented properties of languages, covering phonology, grammar and lexical organization. Its online presentation connects feature values, explanatory chapters, maps and references. The first book version appeared in 2005, followed by an online version in 2008.^[ref]

One chapter classifies the relative order of subject, object and verb. It distinguishes six dominant orders and a category for languages lacking a dominant order. The author also explains the operational meanings used for the participant labels, which need not match every grammatical framework.^[ref]

This makes the resource useful as inspectable scientific data, rather than merely a colored map. A blank entry does not establish that a feature is absent, and a category assignment depends on its chapter's definitions. Reproducible analysis records the feature, dataset version and selection rule; the provider requests citations to the specific chapters supplying data.^[ref]