... PRESENT PERFECT...

... PRESENT PERFECT...

We use the Present Perfect to say that an action happened at an unspecified time before now. The exact time is not important.


We can use the Present Perfect with unspecific expressions such as:

ever

never

once

many time

several times

before

so far

already

yet

Examples:

I have seen that movie twenty times.
I think I have met him once before.
There have been many earthquakes in California.
People have traveled to the Moon.
People have not traveled to Mars.
Have you read the book yet?
Nobody has ever climbed that mountain.
A: Has there ever been a war in the United States?B: Yes, there has been a war in the United States.