Translation:After coming to Tanzania we spoke Swahili
From my travels in Tanzania I found that "-ongea" or "-zumgumza" are more common than "-sema".
Agree. Kusema = to say; 'ongea' and 'zungumza' = to converse, to talk, to speak (in this context). Alisemaje? What did he say? 'Tumezungumza (-ongea) na wazazi' = we had a conversation with (spoke to) our parents...