This sentence uses the adjective “steady” to modify the verb “blinked.” An adjective cannot modify a verb, but an adverb would be correct in this context. The corrected sentence reads, "The red indicator light blinked steadily on and off throughout the night; it was the only sign that the machine was running."

In this sentence, an adjective is misused as an adverb. Since “meticulous” modifies the verb “work,” it should be an adverb. The corrected sentence reads: "When calibrating the new equipment, it is essential to be patient and work meticulously."

This sentence uses an adjective (“comfortable”) to modify a verb (“settled”), which is not grammatically correct. Using an adverb instead of an adjective would be appropriate, however. The corrected sentence reads, "Schwartz climbed into the spacious limousine and settled himself comfortably on one of the long leather seats."

This sentence uses the adjective “breathless” to modify the verb “watched”. An adjective cannot be used to modify a verb, but an adverb can, so an adverb would be more appropriate. The corrected sentence reads, "The audience watched breathlessly as the contortionist brought her leg behind her back and in front of her nose."

In this sentence, the adjective “tragic” is misused to modify a verb, “cut short.” An adverb would be correct here. The corrected sentence reads, "The mademoiselle’s promising career in opera was tragically cut short by a falling piano."

In this sentence, the adjective “smooth” is used to modify the verb “went.” An adverb would be correct in this situation. The corrected sentence reads, "Francisca was nervous that the sudden arrival of fifty international students would be overly chaotic, but fortunately everything went smoothly."

Adverbs often end in "–ly" (e.g. "quickly," "slyly," and "happily"). Without this "–ly" ending, swift is only an adjective (e.g. "He is a swift runner."). In this case, “swift” acts as an adverb (describing how the track star runs), so it should be written “swiftly.”

This sentence uses an adverb (effortlessly) to describe a noun (trick). An adjective would be more appropriate. The corrected sentence reads:While the trick may look effortless, the actual execution of a perfect double back handspring is quite tricky to achieve successfully.

This sentence uses the adjective "terrible" to modify the verb "performed." An adverb is more appropriate. The corrected sentence reads, "Although the eighth grade math bowl team did excellently in practice, the members performed terribly in the actual tournament."