Spayed means a female dog has had her reproductive organs (ovaries and uterus) removed. Neutered means technically that an animal has been de-sexed, but usually is used to refer to a male dog being castrated.
A complement is a word or word group. that completes the meaning of a. verb. Every sentence has a subject. and a verb. Sometimes the subject. and the verb can express a. complete thought all by themselves.
Here a car is the Subject, the Verb is was and the Complement defining the Subject is what she wanted for her birthday, which is a clause since it has its own Subject (she) and Verb (wanted). Other examples of clauses used as subject Complements are: Justice is what weâre looking for.