Often when I am writing emails or any other documents, I would like to use the irregular forms of "dream" ( dreamt ) or "learn" ( learnt ). But the spell-checkers always underline these irregular verbs, including right now on this very question that I am writing !

I know I have seen the words before however. Don't know where, but surely I don't have a habit of making up words of my own. Also, checking [this website][1] confirms that the words do exist and should be correct, I believe ?

Can someone please clear up what this is all about, and why spell-checkers treat dreamt and learnt as incorrect ? Thank you.


  [1]: http://www.usingenglish.com/reference/irregular-verbs/