How/What fun it is!

[diamondcutter]

L33 Kim’s Favourite Season
...
During this season, I can enjoy the different colours of the leaves. They are red, orange, yellow, green and brown. I like to play in the leaves with my friends. How fun it is!

(English for Fun 7B, an English textbook for junior high school students in China, published by DC Canada Education Publishing and Hebei Education Press)

I wonder if the last sentence should be “What fun it is!”

 

[jutfrank]

I suppose it's grammatical to use fun as an adjective like that (rather than a noun as in What fun it is!), but it does sound odd.

 

[GoesStation]

I'm okay with both versions.

 

[emsr2d2]

I find "How fun it is!" completely unnatural in BrE.

 

[Phaedrus]

I suppose it's grammatical to use fun as an adjective like that (rather than a noun as in What fun it is!), but it does sound odd.

Is "Jingle Bells" sung in England? It contains a couple of classic examples of that construction:

"Oh, what fun it is to ride
in a one-horse open sleigh!"

"What fun it is to sing
a sleighing song tonight!"

 

[JMurray]

I hear "very fun", "a fun thing" and similar forms quite regularly. A search of "very fun" in fraze-it gives plenty of examples, including a few from the UK.
https://fraze.it/n_search.jsp?hardm=1&t=0&l=0&p=1&q=very+fun

However, the exclamation "How fun it is!" in the original post does strike me as unusual.

 

[Tdol]

How about How much fun?