42. Which of the following sentences is grammatically incorrect?

Answer: B

Explanation:

He performed good on the test is grammatically incorrect.

The sentence "He performed good on the test" is incorrect because the adjective "good" should be replaced with the adverb "well" to modify the verb "performed" correctly.

A) He performed well on the test

This sentence is grammatically correct. The adverb "well" appropriately modifies the verb "performed," indicating the manner of his performance.

B) He performed good on the test

This sentence is grammatically incorrect because "good" is an adjective and should not be used to modify the verb "performed." The correct form is "He performed well," using the adverb "well" to describe how he performed.

C) He performed poorly on the test

This sentence is grammatically correct. The adverb "poorly" correctly modifies the verb "performed," describing the manner of his performance.

D) He performed adequately on the test

This sentence is also grammatically correct. The adverb "adequately" modifies the verb "performed," indicating a satisfactory level of performance.

Conclusion

The sentence "He performed good on the test" is definitively incorrect due to the misuse of the adjective "good" instead of the appropriate adverb "well." All other options are grammatically correct and use adverbs to accurately describe the manner of performance, demonstrating proper grammatical structure.