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 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.

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 computer spellcheckers always underline these words as being “wrong”, including right now on this very question that I am writing !

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

Can someone please clear up what this is all about, and why (some?) spellchecking software treats dreamt and learnt as incorrect?