Form and rules
How it works
1
Use the past simple with finished past-time expressions such as yesterday, last year, in 2022 and two days ago.
2
Use the present perfect when no finished past time is stated and the experience or present result is important.
3
Questions with When...? normally ask for a finished time, so they usually use the past simple.
4
Use the present perfect with for and since when a state or situation started in the past and continues now: We've lived here for five years.
5
Do not put a finished past-time expression with the present perfect: say I saw it yesterday, not I have seen it yesterday.