Intensifiers: so tired, such a mess, so much, such beautiful weather
So + adjective/adverb; Such + (a/an) + adjective + noun
Not so/such + adjective/noun
Why is it so/such...?
💡 Such a + singular countable; such + plural/uncountable (no 'a').
✓It was such a good movie.
✗It was so a good movie.
Such + a + adjective + noun.
✓I'm so hungry.
✗I'm such hungry.
So + adjective (no noun).
✓Such beautiful weather!
✗Such a beautiful weather!
No 'a' with uncountable nouns.