# One conversation, more than one language

Published October 28, 2026 · Essay · Pan-African AI Lab · info@paal.website

Picture an ordinary conversation. You start in isiZulu, move into English partway through a sentence and come back again, because that is how you would naturally say it. The person listening follows you without a second thought. Machines have found this much harder.

Moving between languages inside one conversation, and often inside one sentence, is common in many multilingual communities in Africa. It is usually not a sign that a speaker lacks words in either language [1]. One influential account, built on evidence from Africa, argues that the switches carry meaning of their own: speakers use them to negotiate who they are to each other, how formal the moment is, and how they want to be seen [1].

Researchers who surveyed the field in 2019 described code-switched speech and language as an area with many open problems [2].

The result is a quiet mismatch. Voice systems are reaching more and more people, and many of those people do not stay in one language. They are asked, in effect, to talk the way the machine expects, or to give up and use a language that is not the one they think in.

We think a voice system should meet people where they are. A model that converses in South Africa's languages has to follow you when you switch in the middle of a sentence, as easily as the person listening did. That is part of what we are building at Pan-African AI Lab.

We do not underestimate how hard this is.

## References

[1] Myers-Scotton, C. (1993). *Social Motivations for Codeswitching: Evidence from Africa.* Oxford: Clarendon Press.
[2] Sitaram, S., Chandu, K. R., Rallabandi, S. K., and Black, A. W. (2019). A survey of code-switched speech and language processing. arXiv:1904.00784.