Grammatical tense

In the study of grammar, tense is a category used to express time reference. It allows speakers to place a state or an action at a specific time relative to when they are speaking. This is known as absolute tense. However, time can also be relativized to a different point in a story. This is called relative tense. For example, a speaker might refer to a moment that was already in the past. This creates a "past-in-the-past" or pluperfect construction. Tense is a vital tool because it provides a temporal framework for human communication.

Languages use different mechanisms to mark these time references. One common method is inflection, which involves changing the form of a verb. This can happen through affixes, such as adding the "-ed" ending to regular English verbs. It can also occur through stem modifications, like ablaut, which changes the internal sound of a word. Some languages use reduplication, or repeating parts of a word, to show tense. Other languages rely on multi-word constructions. These often use auxiliary verbs, which are "helping" verbs, or clitics. The French passé composé is a clear example of this combined method.

Grammatical systems often organize tense into distinct stages or types. While many people think of three main tenses—past, present, and future—languages vary greatly. Some languages, like Arabic and Japanese, use only two tenses: past and nonpast. In these systems, the nonpast category covers both the present and the future. Other languages, such as Greenlandic and Quechua, use future and nonfuture. Some languages are even more precise. The Kalaw Lagaw Ya language of Australia uses six tenses. It distinguishes between the remote past, recent past, and today past. It also separates the today/near future from the remote future.

History shows that our understanding of tense has been shaped by classical studies. Many early grammarians were monks who used Latin as their primary reference point. Because of this, much of our modern terminology comes from Latin. For instance, the word "tense" comes from the Old French word for time, which originated from the Latin "tempus." We still use Latin terms like "perfect" to describe certain verb forms today. However, modern linguistic theory often re-evaluates these terms. What was once called a tense might actually be a combination of different grammatical categories.

To understand tense deeply, one must look at its relationship with aspect and mood. Aspect describes how an action relates to time, such as whether it is completed or ongoing. For example, the perfective aspect denotes a complete event. The imperfective aspect describes a repeated or ongoing situation. Mood expresses modality, which includes things like certainty, obligation, or wishes. Because these three categories are often expressed together, linguists call them a TAM system. This stands for Tense, Aspect, and Mood. In many languages, it is difficult to separate one from the others.

There are also many surprising ways that languages handle time. Some languages use "hodiernal" tenses, which refer specifically to things happening today. Some use "crastinal" tenses for tomorrow, or "hesternal" tenses for yesterday. The Washo language even has tenses to indicate if an event happened before the speaker's lifetime. Some languages even mark tense on nouns instead of verbs. This rare phenomenon is known as nominal tense. An example of this can be found in the Kayardild language, where case markers indicate time.

Finally, it is important to note that not all languages use tense at all. These are called tenseless languages. Examples include Burmese, Thai, and most varieties of Chinese. These languages do not use verb changes to show time. Instead, they use lexical items, which are specific words or time phrases, to establish when something happens. In Mandarin, the auxiliary verb "huì" can indicate a future action. Even without formal tense, these languages successfully communicate the flow of time through context and other grammatical tools.