Swahili

Swahili distributes nouns across roughly fifteen classes, each marked by a prefix that drives agreement throughout the sentence. Class 1/2 is for people, class 3/4 for plants and natural phenomena, class 7/8 for things and instruments, class 11/14 for abstracts, and so on. Verbs, adjectives, and pronouns all agree with the noun class. Once the system clicks, it organizes vocabulary into intuitive categories, but learners spend the longest stretch of the curve internalizing it.

Substantial — perhaps 25–30% of Swahili vocabulary is of Arabic origin, especially in numbers, days of the week, time vocabulary, religious vocabulary, and trade-related words. Arabic-speaking traders settled along the East African coast over centuries, and Swahili's coastal origins and historical use as a trade language brought heavy borrowing. Arabic loanwords are usually adapted to Bantu phonology and morphology, fitting the noun class system.

Tanzania (where Swahili is the national language and dominant lingua franca), Kenya (co-official with English), Uganda, Rwanda, Burundi, the eastern Democratic Republic of the Congo, and parts of Mozambique, Zambia, Malawi, and the Comoros. Swahili serves as a regional lingua franca across this whole zone and has been adopted as an official language of the African Union and the East African Community.

Pronunciation is regular and matches the spelling. The Latin alphabet is shared. The grammar is light on irregular morphology — verbs follow predictable patterns. The hard parts are the noun class system (every noun assigns its class, and the agreement propagates), the verb morphology (multiple subject, object, tense, and mood markers stacked on a single verb), and adapting to a vocabulary mostly without English cognates.

Modern Swahili uses the Latin alphabet, adopted in the colonial period. Historically, Swahili was also written in a modified Perso-Arabic script — Ajami — used along the Swahili coast for centuries in religious, literary, and commercial contexts. Some Swahili poetry and traditional literature is preserved in Ajami, but contemporary publishing uses the Latin script almost exclusively.