'How lovely these flowers are!' 'How silly you boys are!'
(I have no idea what point of structure we're talking about here, Taka-- I'm just giving you the native sentences. What does your reference say about this structure exactly?)
Yes I've found the reference-- it's over in 'adjectives', and has to do with the rather anomalous order of adjectives with intensifiers 'how, too' etc. where the order of indefinite article and attibutive adjective is reversed. So, just as we cannot have 'X how lovely flowers these are', we also cannot have 'X how a lovely flower this is'.-- we must use 'what' in
Yes, I know the rule, and that's why I'm confused. I mean, "How many children there are who really need love!" is OK, but "How lovely flowers these are!" is not, right? But structually, they are the same, aren't they?
'Many' is a quantifier, and doesn't work the same way as a descriptive adjective. 'How many/few flowers you have' is fine but 'how lovely flowers you have' is not. I'll let you know if I find out 'why', and you let me know if you find it, eh?