To express an important change that has occured at an indefinite time in the past., Only twelve people have walked on the moon., To indicate that an action has not happened but may soon happe (with yet), Researchers have not discovered a cure for cancer yet., To refer to a situation that began in the past and continues in the present. (since/for), Brasilia has been the capital of Brazil since 1960., To refer to an action that has happened several times in the past and may happen again. (no specific past time), Humans have landed on the moon about 15 times., To indicate that a person or thing has/has not had the experience of doing something. , This area has never experienced an earthquake.

Using Present Perfect B1 level

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