72. The verb "povi", to be able, is used to translate English "can",
which is defective, that is, does not occur in all of the forms a verb
may have:
Mi povas paroli, I am able to talk, I can talk.
Mi povis paroli, I was able to talk, I could talk.
Mi povos paroli, I shall be able to talk, ------.
Mi volas povi paroli, I wish to be able to talk, ------.