Columbia subject headings:
English language--Imperative.
English language--Interjections.
English language--Interrogative.
English language--Semantics.
English language--Sentences.
Harvard subject headings:
English language--Imperative
English language--Interjections
English language--Interrogative
English language--Semantics
English language--Sentences
Princeton subject headings:
English language--Imperative.
English language--Interjections.
English language--Interrogative.
English language--Semantics.
English language--Sentences.