I .............. Johny last week.
met
have met
meeted
Where .................... yesterday?
have you gone
did you go
have you went
We use Present Perfect for completed actions.
We use Past simple for completed actions.
I ..........my project two days ago.
has done
have done
did
She .................... 3 books up to now.
wrote
has written
have written
She ................ a detective novel last year.
I ....................... anything since lunch.
haven´t eaten
didn´t eat
ate
For, since, already, yet are signal words for Present Perfect.
We use "ago" with Past Simple.