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 verb is a main part of speech that is often used to describe or indicate an action. Action verbs tell what the subject of a sentence is doing. Action verbs include words such as run, write, think, sleep and wonder, among thousands of others. To unlock this lesson you must be a Study.com Member.