1. old is not a subject it is an adjecive
2. you need a sentantance to have a compound subject
3. subject is always a noun
4. for it to be a compound subject you need a word like and, or, neither etc.
5. you need 2 nouns as a subject with one of the words mentioned in #4 between them
A subject can be compound or singular. If it is compound, then both are the subject. Example:John and Jeff rode their bikes.
compound subject
A compound subject is a sentance with two or more subjects.
Tony and I went to the movies. Tony and I is the compound subject.
a compound subject is two or more subjects joined by a conjuction
The subject isn't compound -- Kate is the subject.Wrote and edited is the compound predicate.
Some compound subject pronouns are someone, anyone, everyone, and whoever.
first of all your sentence is incorect! it would be "What is "a" compound subject"anyways a compound subject is when you have two subjects like in this sentence-Dave and Bill went to the movies together to see 2012.Dave and Bill would be the compound subject.
The sentence describes a compound subject, specifically a compound subject of a sentence as it consists of two separate subjects, "Gina" and "Sydney."
Compound
Compound subject: Michelle and Diego Compound predicate: wanted to write poems
No it is not.