Réponse:

the deference

Explications:

hey! ..so

we use the simple past when the action started in the past, finished in the past, and is not continuing now and for the present perfect we use it when the action started in the past and is continuing now. The simple past tells us that an action happened at a certain time in the past, and is not continuing anymore and The present perfect tells us that an action started in the past and it is still happening now, or it is something that happens regularly. We may need more information to tell us how long it has been going on. It may also tell us that the time period it started in is still going on.