Even though English is the recognized language of commerce and science in South Africa, only 8% of South Africans speak English at home.
There are 11 official languages: Sepedi, Sesotho, Setswana, siSwati, Tshivenda, Xitsonga, Afrikaans, English, isiNdebele, isiXhosa and isiZulu. The three most spoken are Zulu (23.8%), Xhosa (17.6%) and Afrikaans (13.3%).
I think I can figure out Afrikaans (it's a lot like Dutch, which is sort of between German and English), but there's no hope with the others. That's another reason I'm considering this trip a great adventure. I leave in 13 days.