Watch the video. It will help you understand the difference between Present Perfect and Past Simple.
Present Perfect is similar to the past, but with no specific time:
And it is centered in the experience, not time: Other examples:
PRESENT PERFECT
The PRESENT PERFECT is often used with the following time expressions: How long...? ...for... ...since... ...just... ...lately ...recently ...ever... ...already... ...never... ...yet...
PAST SIMPLE
The PAST SIMPLE is often used with the following time expressions: ... ago ... yesterday ...last week / month / year ...
EXERCISES ON USE: Past Simple or Present perfect?: