It a secondary or a tertiary of the sentence, it is verb- and adverb- oriented. It is not determined by the semantic meaning of the verb. Types of adverbial modifiers are determined by semantic varieties or semantic types of adverbs.We distinguish adverbial modifiers of manner, measure, cause, attendant circumstances, time, exception, direction, place, comparison (real/unreal), concession (real/unreal/problematic). It can be facultative and indispensable( He broke the thing gently. They took the boy to the theatre.) Complex adverbial modifiers are expressed by predicative constructions{ He entered the room, the dogfollowing him (a nominative absolute participial construction). He entered the room, with his dog following him (a prepositional participial construction)
An Attribute
An attribute is a noun- oriented secondary or tertiary part of a sentence. It doesn’t enter the structural scheme of the sentence. Very often it facultative and can be easily omitted (A beautiful girl entered a spacious room). It can be used in pre-position and post-position. Its position is determined by its semantics. Attributes giving more concrete character to a noun are placed nearer to it than those giving general assessment (An attractive small girl). It can be complex, when it is expressed by a predicative construction (This is a book for you to read). An attribute very often merely decorates a sentence, but there are instances when without it a noun is communicatively empty (She has blue eyes), which makes it obligatory.