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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.

Bernard Comrie is a linguist specializing in linguistic typology and historical comparisons of languages. His research includes grammatical tense, grammatical voice and numeral systems, with fieldwork in geographically distant communities. His own account emphasizes examining many different kinds of language when assessing generalizations.^[ref]

A simple methodological example shows why this matters. English can form a passive voice construction such as The pump was repaired. Finding that construction in one language establishes a possibility, while a claim about all languages requires much wider evidence and explicit criteria for recognizing the relevant construction. This illustrates the difference between a description and a proposed cross-language generalization.

Bernard Comrie co-developed the Leipzig Glossing Rules by Bernard Comrie and others with Martin Haspelmath and Balthasar Bickel. The conventions expose how a proposed analysis segments and labels an expression, helping other researchers evaluate it.^[ref]

Bronwyn Bjorkman is a linguist whose research connects linguistic morphology, syntax and semantics. Her Queen's University profile identifies a particular focus on grammatical tense and grammatical aspect: how word forms and sentence structure express temporal relationships. It also describes work on the representation and manipulation of grammatical information.^[ref]

This work separates the form of an expression from the interpretation it receives, rather than assuming that a grammatical ending has the same function in every language. She received her doctorate from the Massachusetts Institute of Technology in 2011 and is a coauthor of Essentials of Linguistics (2nd edition) by Catherine Anderson and others.

FieldWorks Language Explorer is software for building lexical resources and analyzing language data. It combines a lexical database with text analysis, allowing forms in a text corpus to be connected to entries and proposed analyses into morphemes. Its official documentation describes both manual and automatic word parsing and the production of dictionary and grammatical resources.^[ref]

For an illustrative workflow, a recorded occurrence of walked can be associated with a WALK lexeme, a segmentation into walk and -ed, and a past grammatical tense analysis. An interlinear gloss can display these aligned layers while preserving the original form. A later occurrence supplies a chance to test the analysis rather than merely reproduce a translation. Alternative segmentations and meanings must still be evaluated from evidence. FieldWorks Language Explorer organizes the data and proposed relationships; using the software does not itself establish that an analysis of linguistic morphology is correct.

Grammatical aspect presents a temporal view of an event or state, for example as ongoing or as a whole. It concerns how the event is viewed, whereas grammatical tense concerns its relation to a temporal reference point. Affixes and auxiliary constructions can express aspectual distinctions.^[ref]

Compare “The train arrived” with “The train was arriving”. Both locate the situation in the past, but the second presents an unfolding situation and does not by itself assert a completed arrival. Comparing “is arriving” with “was arriving” instead changes tense while retaining the progressive construction. Such contrasts help isolate which part of an interpretation comes from each grammatical choice. A formal semantics can encode those differences explicitly, rather than treating every temporal expression as the same kind of label.

Grammatical tense locates an event or state relative to a temporal reference point, commonly the time of speaking. A language may mark it through verb forms or grammatical constructions. Temporal reference itself is broader: a time expression can convey when something happens without being a tense marker.^[ref]

In the simple past statement “The train arrived”, the arrival precedes the speech time. Writing event time $E$ and speech time $S$, this simple relation is $E<S$. “The train was arriving” also has past tense, but changes grammatical aspect by presenting the arrival as unfolding. Thus the two categories answer different questions. A precise model states its reference point and interpretation; identifying a past-looking ending alone does not settle every temporal relation in a complex utterance.

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.

Inflection expresses grammatical distinctions through the forms of a lexeme, without normally creating a new lexical item. Grammatical number, grammatical tense and grammatical agreement can be expressed inflectionally, depending on the language. The distinctions and their overt expression must be kept separate: a grammatical meaning can instead be expressed by a separate word.^[ref]

In one boat and two boats, the ending marks a number contrast while both forms belong to the same lexeme. The pair walk and walked similarly contrasts grammatical forms of a verb. By comparison, deriving kindness from kind creates a new lexical item through derivational morphology. A computational description can store the base together with grammatical features, then predict its surface form. Irregular forms show why that prediction cannot always be reduced to concatenating one universal ending.

An interlinear gloss aligns a linguistic example with an analysis of the meanings or grammatical properties of its words and morphemes. It commonly combines an original-language line, a segmented line, analytical labels and a freer translation. The aligned analysis provides information that the translation alone can conceal.

The Leipzig Glossing Rules by Bernard Comrie and others specify word alignment, matching hyphens at segmentable morpheme boundaries, and abbreviated grammatical labels.^[ref] In the original English illustration walk-ed / walk-PST, PST identifies past grammatical tense; the matching hyphens connect the ending with its proposed contribution. The unsegmented surface form is walked.

A matching number of boundaries does not prove the segmentation correct. The rules explicitly distinguish the gloss from the original data: different analyses can describe the same recorded form. An interlinear gloss therefore makes claims about linguistic morphology inspectable while preserving the need for independent evidence about those claims.

SIL International is a language-focused organization whose name appears as the publisher of linguistic reference materials and software documentation. Its glossary distinguishes concepts such as grammatical tense, which locates a situation relative to a reference time, and grammatical aspect, which describes its temporal presentation.^[ref][ref]

Its language-technology work includes FieldWorks Language Explorer, software for organizing lexical entries, analyzing texts and describing grammar. An investigator can connect an observed word form with an analysis into morphemes, then compare that analysis across further recorded examples. Such tools make a proposed linguistic morphology inspectable; the stored analysis still needs evidence from language use.^[ref]

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.