What is the English translation of the Italian phrase 'Ah sì ben mio'?

"Oh, yes, my love!" is one English equivalent of the Italian phrase Ah, sì, ben mio!

Specifically, the interjection ah is "oh!" The adverb sì means "yes." The masculine noun bene* means "affection, love" in this context. The masculine possessive adjective mio translates as "my." The entire phrase will be found leading into Manrico's aria in the opera Il Trovatore ("The Troubador") by Giuseppe Verdi (1813-1901).

The pronunciation will be "ah SEA behn MEE-o" in Italian.

*The final vowel may drop in poetic contexts.