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Related to previously: willingness, pushy, acknowledged
If you are talking about a period measured back from some earlier time, you use before or previously.
You only use ago when you are talking about a period of time measured back from the present.
You use for to say how long a period lasts in the past, present, or future, or how much time passes without something happening.
You use since to say when a period of time started.
You also use since to refer to the last time that something happened, or to how much time passes without something happening.
|Adv.||1.||previously - at an earlier time or formerly; "she had previously lived in Chicago"; "he was previously president of a bank"; "better than anything previously proposed"; "a previously unquestioned attitude"; "antecedently arranged"|
previously[ˈpriːvɪəslɪ] ADV (= earlier, formerly) → antes, anteriormente; (= in advance) → con antelación, previamente
as previously mentioned → como se ha mencionado antes or anteriormente
previously, the country had been divided in two → antes or anteriormente, el país había estado dividido en dos partes
she read out a previously prepared speech → leyó un discurso que había preparado con antelación or previamente