1. Present perfect simple
Uses:
For past actions when we don’t know the exact time or it isn’t important:
Have you seen the video Dom’s updated?
For experiences in your life: (with ever and never)
Have you ever been to Europe?
For recent actions (with: just / yet / already / recent)
The queen has just given a speech.
For actions that started in the past and continue up to now:
John has lived in Argentina since 2001.
For finished past actions that have a RESULT in the present:
I've lost my keys (so I can't get into my house).

2. Form: