FORM = [has/have + past participle]
Examples:
· You have
eaten too much chocolate.
· Have you ever
eaten too much chocolate?
· You have
not eaten too much chocolate.
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.
