Hello. I've been studying Esperanto for about a year, and have come up against various difficulties with some words. Most of which I eventually figure out and resolve myself. However, given that I have only Lernu! to teach myself Esperanto and thus have to use the site's dictionary for translations, I've been at a loss as to the distinction between the words "de" and "da". I see both used as an equivalent to the English "of", but for the life of me cannot figure out the difference between the two. Could anyone help me here?