Complements occur when two different lexical categories are joined. If this explanation is confusing, don't give up at this point!
	To make things simpler, we are specifically going to discuss adjectival,  nominal, and adverbial phrases found in the predicate of a clause. These phrases are linked to the subject of the clause by certain verbs.  BE is the most important of these verbs.
	These verbs are known as linking verbs.  Besides the verb BE, linking verbs include the verbs SEEM, TOUCH, TASTE, and FEEL.
	Complements that are adjectival phrases are adjectives that describe the subject of the clause.
	Complements that are nominal phrases are nouns that are the same as the subject of the clause.
	Some verbs accept as a complement a prepositional phrase with the preposition "like".
	Some verbs accept as a complement a nominal clause beginning with "as."

For example:

       

	Some apples are red. (an adjectival phrase complement)
	All apples are fruit.  (a nominal phrase complement)
	These apples taste like pears.  (an adverbial  prepositional phrase complement)
	These apples taste as sweet as pears do.  (a nominal clause complement)