Usage of what and how in exclamatory sentences in English

Usage of what and how in exclamatory sentences in English: When introducing exclamatory sentences, how is used to modify adjectives, adverbs or verbs, but cannot modify nouns, while what is used to modify nouns.

To ask about the temporary phenomenon of someone or something, you usually use how; to ask about the lasting characteristics of someone or something, you usually use what.

Usage of exclamation of what: 1. what+a/an+adjective+countable noun singular+subject+predicate. 2. what+adjective+uncountable noun+subject+predicate. 3. what+adjective+plural countable noun+subject+predicate.

Usage of exclamation of how: 1. How+adjective+subject+predicate. 2. How+adverb+subject+predicate. 3. How+subject+predicate.

Usage of interjection what:

1. What+a/an+adjective+countable noun singular+subject+predicate, example:

What a nice day it is! What a beautiful weather!

What an interesting book that is! What an interesting book that is!

2. What + adjective + plural form of countable noun + Subject + Predicate, example:

What beautiful flowers they are! What beautiful flowers!

What good teachers they are! What good teachers they are!

3. What+adjective+uncountable noun+subject+predicate, example:

What fine weather it is! What a nice weather!

What delicious food it is !What delicious food this is!