I’m from Vietnam. I’ve been in the UK for 10 years now. When I met my English husband 13 years ago at 19 I knew 0 English. We communicated using machine translation. So that’s when I started learning English. Fast forward to present day after immersion, living in an English speaking country, formal study, etc. and I’d say my writing and listening (understanding) are good, but my speaking and reading are still bad. I kind of gave up on trying to become fluent at this point.
I don’t have a source but I’ve read that young children can learn up to 4 languages at once, without mixing them up, before they show any sign of strain.
Switzerland has 4 official languages
Yeah, but trust me. People in Zurich only learn German and a bit of French, they don’t care about Italian or Ladin.