Present Perfect

[HAS / HAVE] + [past participle]

EXAMPLES:
I have seen that movie many times.

I have never seen that movie.

NOTE: When you are using a verb tense with more than one part such as Present Perfect (have seen), adverbs usually come between the first part and the second part (have never seen).
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We use the Present Perfect to say that an action happened at an unspecified time before now. The exact time is not important. You CANNOT use the Present Perfect with time expressions such as "yesterday," "one year ago," "last week," "when I was a chlid," "when I lived in Japan," "at that moment," "that day" or "one day." We CAN use the Present Perfect with expressions like "ever," "never," "once," "many times," "several times," "before," "so far," "already" and "yet.

EXAMPLES:

I have seen that movie twenty times.

I think I have met him once before.

There have been many earthquakes in California.

Has there ever been a war in the United States?
Yes, there has been a war in the United States.

People have traveled to the moon.

The concept of "unspecified time" can be very confusing to English learners. It is best to associate Present Perfect with the following topics

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