In British English, we use the present perfect to talk about an action or situation in the past when we don't know the exact time or it isn't important.
- I've invited Dave and Sue for dinner.
We use the past simple to talk about a specific time in the past.
- I phoned my brother yesterday.
We often use the present perfect to start a conversation about our experiences. If we want to ask about or give more details, we use the past simple.
- ‘Have you ever visited your cousins in Canada?’ ‘Yes, we went there last year.’