A sentence adverb modifies an entire sentence, not a single verb or adjective. It expresses the speaker's attitude toward the situation they are describing — their judgment, their level of certainty, or the way they want their words to be taken.
Compare these two sentences:
In the first, honestly describes how she answered — it modifies the verb. In the second, honestly does not describe anyone's action. It signals that the speaker is being frank about the whole statement. Same word, completely different job.
Position in a sentence
The most common position for a sentence adverb is at the start, followed by a comma.
It can also go in the middle — between the subject and the main verb, with commas on both sides.
A third option is the end, with a comma before the adverb.
Front position is by far the most frequent in writing. Mid-position adds a parenthetical feel. End position is more common in speech and informal writing.
Attitude and evaluation
These sentence adverbs express the speaker's emotional reaction to what happened — whether it was good, bad, expected, or strange.
Each of these could be replaced with a longer phrase — it is fortunate that, it is surprising that — but the single adverb is far more efficient.
Certainty and evidence
This group tells the listener how sure the speaker is, or what evidence they are drawing on.
Apparently and presumably carry a hint of second-hand information — the speaker did not witness the event directly. Obviously and clearly suggest the fact should be plain to anyone.
Honesty markers
These signal that the speaker is about to be direct or candid.
When honestly or frankly opens a sentence, the listener expects a blunt or potentially uncomfortable statement to follow. This is a social cue, not a description of the speaker's character.
Reality and expectations
This group adjusts the listener's assumptions — confirming, correcting, or adding a note of interest.
Actually and in fact often introduce a correction or an unexpected detail. Naturally and of course mark the statement as predictable or self-evident.
A note on "hopefully"
Hopefully is one of the most discussed sentence adverbs. Traditional grammar treated it only as a manner adverb meaning in a hopeful way, but its sentence-adverb use is now standard in both speech and writing.
This means I hope the weather will improve, not the weather will improve in a hopeful manner. The construction is universally understood and accepted by all major dictionaries and style guides.
Sentence adverb or manner adverb?
Several common adverbs can work as either a sentence adverb or a manner adverb, depending on position and punctuation. The comma after a fronted adverb is the clearest signal.
| SENTENCE ADVERB | MANNER ADVERB |
|---|---|
| Sadly, the shop closed. | He smiled sadly. |
| Clearly, this is wrong. | She spoke clearly. |
| Frankly, I disagree. | He answered frankly. |
| Surprisingly, he agreed. | The exam was surprisingly easy. |
In the left column, the adverb comments on the whole sentence. In the right column, it modifies a specific verb or adjective.
Common mistakes
Missing comma after a fronted sentence adverb
Missing commas in mid-position
Confusing sentence adverbs with manner adverbs
Using linking adverbs as if they were sentence adverbs
Placing the sentence adverb after the verb it seems to modify