The comparative form of 'useful' is :

Question

Accepted Answer

The comparative form of adjectives is used to compare differences between the two objects they modify. In English, there are specific rules for forming the comparative form of adjectives, depending on the number of syllables in the adjective.

1. **Explanation for Option 4 ("More useful"):**
   - The adjective "useful" is a two-syllable word that does not end in "y." For such adjectives, the comparative form is typically created by adding "more" before the adjective. Therefore, "more useful" is the correct comparative form of "useful." This follows the standard rule for forming comparatives for adjectives with two or more syllables that do not end in "y."

2. **Explanation for why other options are incorrect:**
   - **Option 1 ("Usefuller"):** This option is incorrect because "usefuller" is not a standard form in English. The suffix "-er" is generally used for one-syllable adjectives (e.g., "tall" becomes "taller"). Since "useful" has two syllables, the correct form is "more useful."
   - **Option 2 ("Usefuler"):** Similar to Option 1, "usefuler" is not a correct form. The use of "-er" is inappropriate for two-syllable adjectives like "useful." The correct comparative form is "more useful."
   - **Option 3 ("The most useful"):** This option is incorrect because it represents the superlative form, not the comparative form. The superlative form is used to describe the extreme or highest degree of a quality among three or more items, whereas the comparative form is used to compare two items. Therefore, "the most useful" is not the correct answer for the comparative form.

In conclusion, Option 4 ("More useful") is the correct comparative form of "useful," adhering to the rules of English grammar for adjectives with two syllables.