The present perfect can cause a lot of confusion for English learners because it is actually used in several different ways.
Simple Past Tense
Subject + regular verb-ed or irregular verb (V2 form, Past Simple)
- Finished time
We lived Japan in from 1995-1998. (a time period that started and ended in the past)
- Definite time
I saw the Eiffel Tower in 2007.
- Series of finished actions
First, he read book and then he watched movie.
- Repeated actions
He went to the cinema every weekend last year.
- in 1994, etc.
- in the 20th century,etc.
- in July, etc.
- on Monday, etc.
Present Perfect Tense
Subject + regular verb-ed or irregular verb (V3 form, Past Participle)
- Unfinished time
I’ve worked as a teacher since 2011. (a time period that started in the past, and continues until now)
- Indefinite time
I have seen the Eiffel Tower.
Have you ever seen this movie?
She has already watched this movie 3 times.