Niger-Congo , Afro-Asiatic , Nilo-Saharan , & Khoisan . -Niger-Congo languages include Swahili, Yoruba , Igbo , & many others. -Afro-Asiatic languages include Arabic , Hausa , Oromo , & many others. -Nilo-Saharan languages include Dholuo , Kanuri , Songhay , & many others. -Most Khoisan languages are endangered, and several