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.
There is now a separate section dealing with issues raised by a verb's VOICE (active/passive). Mood in verbs refers to one of three attitudes that a writer or speaker has to what is being written or spoken. The indicative mood, which describes most sentences on this page, is used to make a statement or ask a question.