present perfect negative form

hi! welcome to this week exercises....

1) watch these videos

https://www.youtube.com/watch?v=BX-Fu6hURW4

https://www.youtube.com/watch?v=-3nx11zwhGU

https://www.youtube.com/watch?v=3F5a5FkHQt8&t=14s

2) listen and answer these exercises

https://learnamericanenglishonline.com/Listening_Lab/Listening_Lab_Exercise_24a_present_perfect__negative_contractions.html

https://learnamericanenglishonline.com/Listening_Lab/Listening_Lab_Exercise_23_present_perfect.html

3) practice the writing by answering these exercises

https://www.ego4u.com/en/cram-up/grammar/present-perfect-simple/exercises

https://www.montsemorales.com/gramatica/PresPerf1-B.htm

https://www.montsemorales.com/gramatica/PresPerf2pdc.htm

https://www.englishexercises.org/makeagame/viewgame.asp?id=2998

https://www.ego4u.com/en/cram-up/grammar/present-perfect-simple/exercises

4) copy or print and answer these papers. ESTA TAREA ME LA ENVIAN POR CLASSROOM