Understanding Adverbs and Superlatives in English Grammar

The question asks us to replace the underlined phrase "the fast" in the sentence "She should run the fast to win the race" with the most appropriate option. This sentence involves understanding how adverbs modify verbs and how to use their comparative and superlative forms.

Analyzing the Original Sentence: "She should run the fast to win the race"

The word "fast" can function as both an adjective (e.g., a fast car) and an adverb (e.g., run fast). In the original sentence, "fast" is intended to modify the verb "run", indicating the manner of running. Therefore, it is used as an adverb. However, the phrase "the fast" is grammatically incorrect in this context. When modifying a verb, an adverb usually doesn't take the definite article "the" before it, especially not in this structure.

Furthermore, the sentence implies a need for the highest possible speed to achieve the goal of winning the race. This suggests that a superlative form is required to express the ultimate degree of speed needed.

Examining the Options for Substitution

Let's look at the given options and evaluate their grammatical correctness and appropriateness in the context of the sentence:

• Option 1: the fastest
• "Fastest" is the superlative form of the adverb "fast". It means at the highest speed. The definite article "the" is often used before superlative adverbs, particularly when they refer to the manner of a specific action or outcome (like winning a race). This option grammatically fits and conveys the meaning that she needs to run at the maximum possible speed to win.
• Option 2: more fast
• "More fast" is an incorrect comparative form. The standard comparative form of the adverb "fast" is "faster".
• Option 3: a fastest
• "A" is an indefinite article used before singular countable nouns. "Fastest" is an adverb (or superlative adjective), not a noun in this context. Using "a" before "fastest" is grammatically incorrect.
• Option 4: the faster
• "Faster" is the comparative form of the adverb "fast". It is used when comparing the speed of two actions or things. While grammatically correct in other contexts (e.g., "She should run faster than him"), it is less appropriate here where the need is for the ultimate speed to win the race, not just a comparison between two speeds. The superlative "fastest" better captures the requirement for maximum effort to secure victory.

Determining the Most Appropriate Substitution

Based on the analysis, the sentence requires an adverb in its superlative form to express the highest degree of speed needed to win the race. The option "the fastest" correctly provides the superlative form of the adverb "fast" and is grammatically appropriate in the context of achieving a specific, high-level outcome like winning a race.

The corrected sentence becomes: "She should run the fastest to win the race."

Revision Table: Forms of Fast

Additional Information: Adverbs and Superlatives

Adverbs modify verbs, adjectives, or other adverbs, providing information about manner, place, time, frequency, or degree. Many adverbs form their comparative and superlative degrees differently:

• Short adverbs (often ending in -ly, but not always, like 'fast', 'hard', 'early') usually add -er for comparative and -est for superlative, similar to adjectives (e.g., fast, faster, fastest; hard, harder, hardest; early, earlier, earliest).
• Longer adverbs (usually ending in -ly) use "more" for comparative and "most" for superlative (e.g., slowly, more slowly, most slowly; carefully, more carefully, most carefully).
• Some adverbs have irregular forms (e.g., well, better, best; badly, worse, worst).

In the context of the sentence "She should run the fastest to win the race," "fastest" functions as a superlative adverb modifying "run," indicating the degree of speed required. The definite article "the" is common before superlative adverbs when the context clearly refers to the specific action reaching the highest degree.