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However, there are several verbs which can be used either as linking verbs followed bypredicate adjectives, or as non-linking verbs modified by adverbs of manner_ Thefollowing examples illustrate the use of the verb to appear as a linking verb and as anon-linking verb_e_g_ Linking Verb: His uncle appeared kind_Non-linking Verb: His uncle appeared punctually at ten o'clock_In the first example, kind is a predicate adjective which modifies the noun uncle_ Inthe second example, punctually is an adverb of manner which modifies the verbappeared_The verbs below can be used either as linking or non-linking verbs:to appearto feelto lookto smellto tasteto becometo growto remainto soundto turnIf the subject of the verb is to be modified, a predicate adjective is required after suchverbs; whereas if the verb is to be modified, an adverb is required_ In the pairs ofexamples below, the verbs to grow, to look and to turn are used first as linking verbsfollowed by adjectives, and then as non-linking verbs modified by adverbs_ Theadjectives and adverbs are printed in bold type, and the words which are modified areunderlined_e_g_ Adjective: As he became old, he grew slow at remembering dates_Adverb: The tree grew slowly_Adjective: They looked anxious_Adverb: We looked anxiously up the street.Adjective: The weather turned cold_Adverb: She turned coldly away from the salesman_In these examples, the predicate adjectives slow, anxious and cold modify the subjectshe, they and weather; whereas the adverbs of manner slowly, anxiously and coldlymodify the verbs grew, looked and turned_See Exercise 5_2_ Adverbs used in comparisonsa_ The formation of comparative and superlative forms of adverbsIt should be noted that many adverbs, such as sometimes, never, here, there, now,then, first, again, yesterday and daily have no comparative or superlative forms_