Check the following links and read about the pronounciation of the regular simple past form -ed ending.
There is a set of exercises from NEW HEADWAY PRONUNCIATION. I´ve attached the mp3 audios too…
https://blog.iesjuandeherrera.net/wp-content/uploads/2019/02/ED-PRONUNCIATION.pdf
https://blog.iesjuandeherrera.net/wp-content/uploads/2019/03/NH-PRONUNCIATION-7.3.mp3
https://blog.iesjuandeherrera.net/wp-content/uploads/2019/03/NH-PRONUNCIATION-7.5.mp3
https://blog.iesjuandeherrera.net/wp-content/uploads/2019/03/NH-PRONUNCIATION-7.6.mp3
https://blog.iesjuandeherrera.net/wp-content/uploads/2019/03/NH-PRONUNCIATION-7.7.mp3
https://blog.iesjuandeherrera.net/wp-content/uploads/2019/03/NH-PRONUNCIATION-7.8.mp3