Confusion of Adjectives and Adverbs
An adjective is often used where an adverb is required, and vice versa. The sentence, She talks foolish, is wrong, because here the word to be modified is talks, and since talks is a verb, the adverb foolishly should be used. The sentence, She looks charmingly, means, as it stands, that her manner of looking at a thing is charming. What is intended to be said is that she appears as if she was a charming woman. To convey that meaning, the adjective, charming, should have been used, and the sentence should read, She looks charming. Wherever the word modifies a verb or an adjective or another adverb, an adverb should be used, and wherever the word, whatever its location in the sentence, modifies a noun or pronoun, an adjective should be used.
39. The adjective and the adverb are sometimes alike in form. Thus, both the following sentences are correct: He works hard (adverb), and His work is hard (adjective). But, usually, where the adjective and the adverb correspond at all, the adverb has the additional ending ly; as, The track is smooth, (adjective), and The train runs smoothly, (adverb).