Past simple -> lezárult, múltban történt
Present perfect -> múltban kezdődött és még mindig tart; az imént történt; az eredményen van a hangsúly; a jelenben van a hatása

Ezeket írnám:
I saw this film last Tuesday.
Have you found your pen yet?
Jane went home and had dinner alone.
I first met Kate at a school party.
When I lived in England I had a good time.
Has Fred always worked in this factory?
The dog brought back the ball.
We haven't ordered our meal yet.
Charles was ill so he had to go to the hospital.
I've finished this letter.
How old was your grandfather when he died?
Mandy went to the disco and met her friends there.
I stopped smoking 5 years ago.
Have you ever seen a crocodile?
I had a good time with Jane at the party, but we haven't met since then.
Fred hasn't arrived yet.
When Jack's wife left him he didn't want to live any longer.
I haven't seen a good film since last month.