Watch the same movie in English with the subtitles on. Pick some characters' speeches to memorize. Do this until you truly can do this in the voice of whichever

Watch the same movie in English with the subtitles on. Pick some characters' speeches to memorize. Do this until you truly can do this in the voice of whichever actor interests you right now. I mean until you can do it on your own without the movie going. You will start to get a feel for the larger chunks and idioms, not to mention therhythms and melodies of it. I'd say we speak as much in rhythm and melody as we do in word choice. I'm a native speaker of American English, and I have trouble understanding David Tennant sometimes because of his chunking, melodies and rhythms- so different from American English. One has to get flexible with these. Regionally, just within the United States it can be tricky.