is a sentence which is used to express strong feelings of wonder, sorrow, liking, desire, fear, etc. An exclamation mark (!) is used at the end of this sentence.
How beautiful she looks!
What a lovely day it is!
What an awful dream I had last night!
Note the word order of this sentence. Although the sentence begins with a ‘wh-’ word, it is not an interrogative sentence because the word order is the ‘subject’ first and the ‘verb’ next, just like in the statement sentence.
How beautiful does she look? Interrogative Sentence
[‘does’ the helping verb of the main verb ‘look’ comes before the main verb “look” – interrogative sentence order; the speaker wants know how she looks]
How beautiful she looks! Exclamatory Sentence
[‘she’ the subject of the sentence comes before the main verb “looks” – exclamatory sentence order; the speaker says that she looks very, very beautiful]