Separation anxiety disorder is the child or adolescent's excessive worry and apprehension about being away from their parents. Children with separation anxiety disorder often fear that their parents will be harmed in some way or will not return to them as promised.
fine adjective or adverb. It's an adjective functioning as a Predicative Complement. A Predicative Complement is a Complement of the verb that describes the Subject or Object. In this case it is describing the Subject. Predicative Complements can be noun phrases, adjective phrases and preposition phrases, but hardy ever - if ever at all - adverbs. The reason we use an adjective phrase here is that this phrase is describing a noun phrase. Modifiers of noun phrases are usually adjectives, not adverbs. Consider the following examples: I'm happy. I'm cold. I'm assiduous. *I'm happily. (adverb as PC, ungrammatical) *I'm coldly.
In this sentence, pretty is an adjective describing the noun girl. Very is an adverb describing the adjective pretty. Identifying an Adverb. You can tell whether or not a word is an adverb by considering its function in the sentence. If it is describing one of those three parts of speech- a verb, adjective or other adverb- it is an adverb. You can also tell whether something is an adverb by looking at the ending of the word.