The sentence is interrogative
A sentence with an interrogative form usually refers to anything like a query. For instance, the interrogative grammar in the English sentence "Is Hannah unwell?" sets it apart from its declarative counterpart "Hannah is sick." In the sentence "Paul knows who is sick," the interrogative clause "who is sick" acts as the complement of the verb "know," which is buried in the sentence.
The structure of interrogatives varies between languages. It is frequently referred to as interrogative grammatical mood when a language has a specific interrogative inflectional form. The glossing acronym can be used to denote interrogative mood or other interrogative forms.
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