8A - PRESENT PERFECT VERSUS PAST SIMPLE

 FIRST WATCH

https://www.youtube.com/watch?v=wEI_O8Ugid0

and more

https://www.youtube.com/watch?v=DcVXHIyTXyI

NOW DO THE EXERCISE

https://www.youtube.com/watch?v=BN2GNnMLjBs

and more

https://www.youtube.com/watch?v=6KacSLeW76w

good luck:)