Помогите, пожалуйста. Я не знаю, где использовать past simple, а где present perfect

Question

Помогите, пожалуйста. Я не знаю, где использовать past simple, а где present perfect

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Answer 1

1 Italy won the World Cup in 2006.
He's happy because States United have won all their matches this year.
2 Can you tidy your room? I have tidied it this morning.
Can you tidy your room? I have tidied it.
3 What time did you arrive home last night?
Has Ben arrived? Yes, he's in the living room.
4 Come on, let's eat. Dad has cooked dinner.
Who has cooked this food? It's delicious.
5 I have met lots of interesting people since I arrived.
Did you meet anyone interesting while you were on holiday?

Answer 2

1a    won
1b    States? have won
2a   have tidied
2b   have tidied
3a    did you arrive
3b    Has Ben arrived
4a    has cooked
4b    has cooked
5a    have met
5b    Did you meet