I think that we use the Present Perfect Simple in order to convey an action that has happened in the past but still affects the present.
For example: if you lose your keys, the action of losing the keys took place in the past but it still affects the present since you can't get into your house.
therefore yoy say: I've lost my keys as oppose to I lost my keys.
Hope I'm right
Have a great weekend
see you on Sunday
- For Teachers