In this article I'm going to help you understand the differences between the simple past and the present perfect. English learners often confuse these two verb tenses.
Let's have a look at some of the key differences below:
I knew Julie for ten years (but then she moved away and we lost touch).
A finished action in someone's life (when the person is dead):
My great-grandmother went to Mexico three times.
A finished action with no result in the present:
I lost my keys yesterday. It was terrible! (Now there is no result. I got new keys yesterday).
With a finished time word (last week, last month, yesterday):
I saw John last week.
We use this tense for things that happened at a definite time in the past.
E.g. "I met my best friend when I was fifteen."
It is formed by adding '-ed' to regular verbs.
Unfinished actions that started in the past and continue to the present:
I've known Julie for ten years (and I still know her).
A finished action in someone's life (when the person is still alive: life experience):
My brother has been to Mexico three times.
A finished action with a result in the present:
I've lost my keys! (The result is that I can't get into my house now).
With an unfinished time word (this week, this month, today):
I've seen John this week.
This tense describes something that happened in the past, but that is related to something in the present.
E.g."I have read three books by Charles Dickens."
It is also used to talk about life experiences, recent events or states or things that started in the past and hasn't changed.
"I have been to America.""I have just finished my dinner.""I've worked for EC since 2008."
We use the past simple for past events or actions which have no connection to the present.
We use the present perfect for actions which started in the past and are still happening now OR for finished actions which have a connection to the present.
We CAN'T use the present perfect with a finished time word.