What term describes a word that performs a syntactic role but contributes nothing to meaning, as in 'It is raining'?

• A. Syntactic expletive
• B. Discourse marker
• C. Auxiliary verb
• D. Pronoun

Answer: (A)

The key idea here is a word that fills a sentence’s grammatical slot without adding real meaning. In "It is raining," the word it acts as a syntactic expletive, providing a subject for the clause without referring to anything concrete. This lets the sentence follow English syntax (subject plus verb) while the weather event itself has no explicit agent or referent to point to. The expletive basically placeholders the subject so the predicate "is raining" can proceed.

This differs from a discourse marker, which structures flow of conversation rather than forming a traditional subject. It’s also distinct from an auxiliary verb, which does carry grammatical meaning like tense or aspect (is helps form the progressive, and contributes to the temporal meaning of the clause). And while it is a pronoun in form, its function here isn’t referential; its purpose is not to stand in for a specific thing.

So the term that describes a word used for a syntactic role but not for semantic content is syntactic expletive.