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.
tense - a grammatical category of verbs used to express distinctions of time. 1  grammatical category, syntactic category - (grammar) a category of words having the same grammatical properties. 2  present tense, present - a verb tense that expresses actions or states at the time of speaking. aorist - a verb tense in some languages (classical Greek and Sanskrit) expressing action (especially past action) without indicating its completion or continuation. past tense, past - a verb tense that expresses actions or states in the past