What is wrong with this sentence.
She lit scented candles so the air will smell sweetly.
It should be "would smell sweet."
She lit scented candles, so the air will smell sweetly.
It should be sweet as it is a predicate adjective modifying air.
Sweetly is an adverb.
....and then there is that subjunctive "would" .... :)
The problem with this sentence is the use of the adverb "sweetly" to modify the verb "smell." In English grammar, certain verbs like "smell" do not typically take adverbs describing how something is perceived. Instead, they are usually followed by adjectives that describe the quality or characteristic of the perception. In this case, "smell" should be followed by the adjective "sweet" to correctly describe the scent in the air.
To fix this sentence, you can replace "sweetly" with "sweet":
"She lit scented candles so the air will smell sweet."
Alternatively, you could rephrase the sentence slightly to better match the intended meaning:
"She lit scented candles to make the air smell sweet."
Remember, when you encounter a sentence that seems incorrect or confusing, it is helpful to identify the specific element causing the issue and understand the grammar or usage rules that apply to that particular situation.