I started my English-language carreer as 11-year old in the last year of elementary school. Then, the first 3 years of high school it was a mandatory subject. And the last 2 years of high school you had to pick at least one foreign language. Figuring, I usually got a 4 or 5 (on a school from 1 to 10) for French and German, and a 7 for English, that choice was easily made (got a 6 for Dutch, btw
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Naturally, most series here have captions, instead of dubbing. As do most movies (unless for the very small). And staying a year in the US helped my English too, a tiny bit