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.
3. used to mean 'small' or 'narrow'. You can also use fine to say that something is very narrow, or consists of very small or narrow parts. She has long, fine hair. When you use fine like this, you can use words such as very in front of it. These pins are very fine and won't split the wood. You can use finely as an adverb with this meaning. Put the mixture in the bowl and add a cup of finely chopped onions.