POTERE means 'CAN'. Io posso; tu puoi; lui/lei puo; noi possiamo; voi potete; loro possono;
I have been looking for this for so long......duolingo just seemed to be throwing these words, and i couldn't make heads or tails off it.
English is a latin language (proprio come Italiano) and possible is a result of the latin "posse" meaning "can"
I wish that Duolingo would ALWAYS realize when a sentence, desired to be translated, was inadvertantly typed in the original. It does on some screens, but not on others.
And 'could' is in the conditional tense. Google has 'yes I could' equals 'sì ho potuto', for what it's worth.