French, German, Dutch, English. My fluency varies from year-to-year depending on which language I use most in daily life. I remember the first time I came back

French, German, Dutch, English. My fluency varies from year-to-year depending on which language I use most in daily life. I remember the first time I came back 'home' and found out that I had trouble adapting to speaking my mother tongue. So bi-/tri-/x- lingualism (is that a word?) is not a fixed, but varying property on one's cv.