I think anyone in India and Africa speaks 4 languages easily.
- their regional language (i.e. Masaai, Yoruba, Xhosa)
- the over-regional language (Arabic, Swahili)
- a coloniser language (English, French)
- and possibly just enough of a neighbouring regional language
I think many Chinese people are also bilingual (i.e. Wu+ always mandarin). They often learn another language in school (English or something geographically closer, like Korean).
























Fun fact: American sign language differs from British sign language, as it is derived from french sign language. So a french and American signer would understand each other, while a Brit would not.