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.
We focused on three types of verbs in this lesson: 1  An action verb is a word that expresses an action that the subject of a sentence does, did in the past, or will do in the future. ( 2 Note that the subject of a sentence is a noun or pronoun that the sentence is about.