Learn Italian: Diventerei un miliardario assolutamente felice. - I would become an absolutely happy billionaire.

To form the present conditional of an -are verb like diventare, you first change the -a- to an -e- in the ending (making the stem diventer-). Then, you add the conditional ending for 'I', which is -ei. This gives us diventerei (I would become).

Would the ending of felice change if the billionaire was a woman?

No, it would stay exactly the same! Adjectives that end in -e in their singular form, like felice (happy), do not change based on masculine or feminine. It would just be una miliardaria assolutamente felice.

How is the adverb assolutamente formed?

In Italian, you can often turn an adjective into an adverb by taking its feminine singular form and adding the suffix -mente (which is just like adding '-ly' in English). The adjective here is assoluto, its feminine form is assoluta, and adding -mente gives us assolutamente.

Why does assolutamente come before felice in this sentence?

When an adverb modifies an adjective (like absolutely modifying happy), it is placed directly before the adjective it describes, just like in English.