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.
A tense is a form taken by a verb to show the time of an action. There are three main tenses: Present tense: things that are true when the words are spoken or written; or are generally true; or for some languages will be true in the future. Past tense: things that were true before the words were spoken or written. Future tense: things that will or might be true after the words are spoken or written.