1.   This is a footnote!
  2.   The root of a verb is the 2nd person singular imperative - the form given as a headword in the dictionary (mol, bris, beannaigh, bailigh). The stem is the form that suffixes are added to, usually given as (mol, bris, beann, bail).
  3.   To summarize the summary of the summary: verbs are a problem.... (apologies to Douglas Adams.)
  4.  ``irregular'' is of course the old term for these verbs, and is no longer acceptable as it is considered offensive. The new term is ``differently conjugated.'' Similarly, what used to be known as ``defective'' verbs are now to be called ``conjugationally challenged.''