Ma certo is an Italian equivalent of the English phrase "But of course."
Specifically, the conjunction ma means "but." The masculine adjective certotranslates literally as "certain" and loosely as "of course." The pronunciation will be "ma TCHER-to" in Italian.
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Certamente is an Italian equivalent of the English word "definitely".
Specifically, the word is an adverb. It is formed by adding the adverbial ending --menteto the feminine adjective certa ("certain, definite"). The pronunciation will be "TCHER-ta-MEN-tey" in Italian.
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Não se sabe ao certo, mas certamente chegaram logo após os
primeiros governadores-gerais tomarem posse nos primeiros estágios
da colonização em nosso país.