First premise: adults can acquire English or another language, not merely learn it.
I have written some posts about this fact.
How do adults acquire a language?
By listening a lot plus intuition about what is being said. According to my class experience, they can reach speaking in English at least for a while.
The process of intervening in class has been: words, phrases, sentences, speaking for a while. / Photo from: landscape-trees-nature-lake-flowers-path-sky-clouds-2146140 www wallspick com