Present Perfect Theory And Exercises

http://www.englishpage.com/verbpage/presentperfect.html

http://www.perfect-english-grammar.com/present-perfect.html

http://www.perfect-english-grammar.com/present-perfect-use.html

http://learnenglish.britishcouncil.org/es/english-grammar/verbs/present-tense/present-perfect

https://www.englishclub.com/grammar/verb-tenses_present-perfect.htm

https://www.youtube.com/watch?v=PaTx5Mx2F4Y

https://www.youtube.com/watch?v=bpjfIF988dA

https://www.youtube.com/watch?v=2hcJECNQDlc

https://www.youtube.com/watch?v=3ADXjc8iXRg

https://www.youtube.com/watch?v=rY4EbGHfo4U&list=PLDxE2Xz435BQ2y4x0iiY4d5Tz6cKeUw1P

https://www.youtube.com/watch?v=IkjJ3yFqPXI

https://www.youtube.com/watch?v=rIVU4svh_Og

https://www.youtube.com/watch?v=u3RVtbj1opU

https://www.youtube.com/watch?v=5tz24sc7Vf8