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 verbal is a word formed from a verb but functioning as a different part of speech. An infinitive is a verbal formed by placing to in front of the simple present form of a verb. Examples: to swim to think to read to be to cut to turn. Infinitives may function as adjectives, adverbs, or nouns.