Time adverbs express how frequently the state or action described in the sentence takes place, or how closely to the present time the action was completed. Time adverbs typically are placed after the first auxiliary verb. Some common time adverbs include: already, always, ever, finally, frequently, just, never, occasionally, often, rarely, seldom, sometimes, and usually.
By the year 2000, computers will already have been in
use for over 50 years.