How is normally not used before nouns , and except for some informal uses, fun is a noun. In other words, you cannot say: how money, how information, how books if you mean 'what a lot' or 'such a lot' or something similar. Yiou can of course say: I can't understand how money spoiled our relationship.
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CliveIf this trend continues, then I think that one day dictionaries will begin to list 'fun' as both a noun and an adjective, and people will stop saying that 'How fun!' is wrong.Hi Clive