PRESENT PERFECT

• 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.