The advert was a great success, even though the model was commercially altered.
(The advert was great even though the model was airbrushed)
Commercially is an adverb.
commercially
Like this: I did my history homework yesterday. That's how you use yesterday as an adverb in a sentence
Adverb
(You would have to use the adverb, which is tenderly.) She touched his face tenderly.
In the English language, "fire" has no adverb form.
The wordm commercial can be noun or an adjective. The adverb form is commercially.
Profoundly is a adverb.
She jumped high up into the air. The word "high" is an adverb in the sentence above.
the adverb for easily is still easily but it depends on how it is being use in a sentence.
Correctly is the adverb in that sentence.
That sentence does not have an adverb.