- present perfect progressive of alter (3rd person singular).
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
The phenomenon has been altering the valley’s landscape since the early 1900s.
From Los Angeles Times • Aug. 13, 2025
The findings underline California’s continuing struggle with a phenomenon that has been altering the landscape since the early 1900s, when wells and pumps began to proliferate in the valley.
From Los Angeles Times • Nov. 25, 2024
His contention is that human intervention has been altering the nature of the marine environment ever since over-exploitation of freshwater species in Europe had driven people out to sea in the 11th century.
From The Guardian • Oct. 7, 2018
BlackBerry, under the leadership of new Chief Executive John Chen, has been altering its focus.
From Reuters • Sep. 25, 2014
For the last twenty-five years, however, the situation has been altering for the better.
From With our Fighting Men The story of their faith, courage, endurance in the Great War by Sellers, William Edward
