Sandie has posted an explanation of how Lexercise deals with irregular words, here: http://support.lexercise.com/entries/421485-what-about-irregular-non-phonetic-words. I have always wondered, though, about classifying words such as "have" and "give" as irregular. I teach them as following the orthographic rule that English words cannot end in the letter 'v'; thus these words end in '-ve'. I'd love to get some feedback on this! Thanks.