(Form has /
have + past participle)
Examples:
You have seen
that movie many times.
You have
not seen that movie many times.
*We use the
present perfect to say that an action happened at an unspecified time before
now.
*The exact
time is not important.
*You can´t
use the Present Perfect with specific time expressions such as: yesterday, one
year ago, last week, when I was a child, when I´ lived in Japan, at the moment,
that.
We can use
the Present Perfect with unspecific expressions, unspecific time such as: ever
never, once, many times ,several times, before, so far, already, yet, etc.
Examples:
* I have
seen that movie twenty times.
* I think I
have met him once before.
*There have
been many earthquake in California.
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