grammatical tense

Grammatical tense is a way languages express the time at which an event described by a sentence occurs. In English, this is a property of a verb form, and expresses only time-related information.Tense, along with mood, voice and person, are four ways in which verb forms are frequently characterized, in languages where those categories apply. There are languages (mostly isolating languages, like Chinese) where tense is not expressed anywhere in the verb or any auxiliaries, but only as adverbs of time, when needed for comprehension; in the same condition, grammatical tense in certain languages can be expressed optionally (such as Vietnamese), for example, "sinh" meaning "birth" and "sanh" meaning "birthed"; and there are also languages (such as Russian) where verbs indicate aspect in addition to or instead of tense.
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