“have went”
*have gone
G.B.Shaw's Pygmalion (adapted into the movie "My Fair Lady") was a pointed needle at the class distinctions found in the British use of language and grammar. Now, Mr Shaw, as an antagonist of almost everything English except for the language, is probably as apoplectic about the current state of English usage as any ghost I know of!
Ah English, your two hard four sew many!