Benign paroxysmal positional vertigo is caused by calcium debris in the semicircular canals (canalithiasis), usually the posterior canal. Medications generally are not recommended for the treatment of this condition.
In grammar, tense is a category that expresses time reference. Tenses are usually manifested by the use of specific forms of verbs, particularly in their conjugation patterns. Basic tenses found in many languages include the past, present, and future. Some languages have only two distinct tenses, such as past and nonpast, or future and nonfuture.
Verb - Tense, aspect, and modality. 1  Depending on the language, verbs may express grammatical tense, aspect, or modality. 2  Aspect [6] [8] expresses how the action or state occurs through time. 3  perfective aspect, in which the action is viewed in its entirety through completion (as in I saw the car)