An adverb is a word that adds information about how, when, where, how often, or to what degree something happens. Adverbs are flexible — they can modify verbs, adjectives, other adverbs, or even whole sentences.
Here quietly tells us how she speaks. That single word changes the picture completely — without it, we know nothing about the manner.
What adverbs can modify
Most parts of speech have a narrow job. Adverbs are different: they attach to four different things.
Verbs
This is the most common role. The adverb describes the action — how it happens, when, or where.
Adjectives
An adverb placed before an adjective adjusts its strength or precision.
Other adverbs
One adverb can modify another, usually to intensify or soften it.
Whole sentences
Some adverbs comment on the entire situation rather than a single word. They usually sit at the beginning of the sentence, followed by a comma.
When an adverb modifies a whole sentence, it expresses the speaker's attitude — not a fact about the verb itself.
How adverbs are formed
Most adverbs come from adjectives. The pattern is straightforward, but there are three groups to be aware of.
Adjective + -ly
The majority of adverbs are made by adding -ly to an adjective.
| ADJECTIVE | ADVERB |
|---|---|
| slow | slowly |
| careful | carefully |
| quiet | quietly |
| serious | seriously |
A few spelling changes apply. If the adjective ends in -y, it changes to -ily: happy becomes happily, easy becomes easily. If it ends in -le, the ending becomes -ly: gentle becomes gently, simple becomes simply.
Same form as the adjective
Some common words work as both adjectives and adverbs without any change. These are sometimes called flat adverbs.
| WORD | AS ADJECTIVE | AS ADVERB |
|---|---|---|
| fast | a fast car | She drives fast |
| hard | a hard question | He works hard |
| early | an early train | We arrived early |
| late | a late meeting | Daniel stayed late |
These are among the most common adverbs in everyday English. No -ly is needed — and in most cases, adding -ly would either sound wrong or change the meaning entirely. He works hard means he puts in effort; he hardly works means he does almost nothing.
Standalone adverbs
A third group of adverbs are not formed from adjectives at all. They are independent words with no adjective partner.
always, never, often, sometimes, here, there, now, then, very, quite, too, almost, already, still, just
These words have always been adverbs. There is no adjective to derive them from.
Main categories
Adverbs fall into several categories based on the question they answer. Each category has its own lesson with full rules and examples — here is a brief map.
Frequency — how often something happens. always, usually, often, sometimes, rarely, never
Manner — how an action is performed. quickly, carefully, quietly, well, badly
Time and place — when or where something happens. now, yesterday, soon, today, here, there, outside, abroad
Degree — how much or to what extent. very, really, quite, extremely, almost, too
The boundaries between categories are not always sharp — soon answers both "when?" and "how quickly?" — but the categories are useful for understanding where each adverb typically sits in a sentence.
A note on position
Unlike adjectives, which almost always go before the noun or after a linking verb, adverbs move around. They can appear at the beginning, middle, or end of a sentence.
All three versions are correct. The preferred position depends on the type of adverb — frequency adverbs tend toward the middle, manner adverbs toward the end, and sentence adverbs toward the beginning. Each category lesson covers its own positioning rules.
Common mistakes
Using an adjective instead of an adverb
Confusing hard / hardly
Confusing late / lately
Confusing good / well
Adding -ly to flat adverbs