Present Perfect FORM [has/have + past participle] Examples:
You have seen that movie many times.
Have you 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 CANNOT 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 that moment, that day, one day, etc. We CAN use the Present Perfect with unspecific expressions 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 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.
PositivePositive Short Form I haveplayed I'veplayed you haveworked You'veworked he haswritten he'swritten she haswalked she'swalked it hasrained it'srained we havetravelled we'vetravelled they havestudied they'vestudied
Ever means from the time you were born until now. Except for rare exceptions, it can only be used in questions and to answers with a no.It is used with have or had + a past participle. Example: Have you ever eaten a frog? Has she ever gone to Australia? When you answer the question, a yes answer will use have/has + past participle. Have you ever seen a whale? Answer: Yes, I have seen a whale. or Yes, I have. If you answer the question with a no, you will need to use haven't /hasn't + ever + past participleor have /has + never + past participle (both of these have the same meaning) Example: Have you ever seen a whale? Answer: No, I haven't ever seen a whale. or No, I've never seen a whale. or No, I haven't.