An adverbial is a word or group of words that works like an adverb, telling us how, when, where, why, or to what extent something happens. While an adverb is usually a single word (like “quickly” or “yesterday”), an adverbial can be a phrase or even a whole clause that does the same job.

For example, in “She ran with great speed,” the phrase “with great speed” is an adverbial because it tells us how she ran, just like the single adverb “quickly” would. In “They arrived before the sun rose,” the clause “before the sun rose” is an adverbial telling us when they arrived.

Teachers use this term because sometimes you need more than one word to add detail to a sentence. When you write “The dog barked loudly,” you're using an adverb. But when you write “The dog barked throughout the entire night,” you're using an adverbial phrase. Both add information about the barking, but the adverbial gives you more flexibility to express exactly what you mean.

Understanding adverbials helps you recognize how sentences can be expanded and made more interesting. Instead of just saying someone walked, you can describe how they walked (with a spring in their step), when they walked (after breakfast), where they walked (toward the old oak tree), or why they walked (to catch the bus).