NOT KNOWN FACTUAL STATEMENTS ABOUT NASCENCY PRONUNCIATION

Being a learner, it'll only at any time beneficial for you to differentiate /ʊ/ and /u:/, not /ʊ/ and /u/, and you will try this by length.since the IPA seem /ʃ/. And native speakers with that dialect typically can't fall that pattern even if they struggle to talk Conventional German.Usually there are some dialects that pronounce some words havi