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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.

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.

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.