Exclamations are often constructed with how and what. Exclamations with so and such are also common.
Exclamations with how
Exclamations with how are now considered a little formal or old-fashioned. In this construction how is followed by an adjective.
Blueberries ! How nice!
The structure ‘how + adjective/adverb + subject + verb’ is also posiible.
How beautiful she is! (NOT How she is beautiful!)
How beautifully she sings! (NOT How she sings beautifully!)
The structure ‘how + subject + verb’ is also possible.
How you have changed!
Exclamations with what
Common structures are: ‘what a/an + adjective + singular countable noun’
What a kind man! (NOT What kind man!)
What a beautiful flower! (NOT What beautiful flower!)
What a pleasant surprise! (NOT What pleasant surprise!)
what + adjective + uncountable / plural noun
What pleasant weather! (NOT What a pleasant weather!)
What beautiful flowers! (NOT What a beautiful flowers!)
What + object + subject + verb
What a beautiful smile you have!
Exclamations with so and such
Common structures are given below:
So + adjective
You are so beautiful!
He is so kind!
Such a/an + adjective + singular countable noun
Such a great experience! (NOT Such great experience!)
Such + adjective + uncountable / plural noun
They are such kind people! (NOT They are so kind people!)