"Unless you run fast", you will miss the bus. The inverted commas clause is?

1. Compound clause
2. Independent clause
3. Adverbial clause
4. None of these

The correct answer is “Adverbial clause.” The clause “Unless you run fast” is a dependent clause that modifies the main clause “you will miss the bus.” It functions as an adverb because it explains the condition under which the main action (missing the bus) will happen. Specifically, it is an adverbial clause of condition, introduced by the subordinating conjunction “unless.” It cannot stand alone as a sentence, so it is not an independent clause. A compound clause typically involves two independent clauses joined by a conjunction, which is not the case here. Therefore, its role as a dependent clause modifying the verb in the main clause makes it an adverbial clause.