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.
Use 1: Actions which started in the past and are still continuing
Ex: She has worked at the University since 1994.
Use 2: Actions which happened at some unknown time in the past
Ex: She has worked at the University since 1994.
Use 3: Actions which happened in the past, but have an effect in the present
Ex:
I've lost my keys. ------> I haven't found the keys yet -- they're still missing.
I've lost my keys. ------> I haven't found the keys yet -- they're still missing.
She's broken her arm. ------> The arm is still injured.´
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