A compound subject is one which consists of more than one noun. (This includes pronouns, noun phrases, and noun clauses.)
When the subject of a sentence is made up of two or more elements, it's called a compound subject.
The individual elements in a compound subject are joined by words like and and or (called coordinate conjunctions) or pairings like either/or and neither/nor (called correlative conjunctions).
Examples of Compound SubjectsHere are some examples of compound subjects (shaded):
Is a Compound Subject Singular or Plural?When and is used to join the elements in a compound subject, the compound subject is treated as plural. For example:
When using or, either/or, or neither/nor, the compound subject might be singular or plural. Generally, if all elements are singular, then the compound subject should be treated as singular.
There is a little more to it than that though.
Read more about using a singular or plural verb with or, either/or, and neither/nor.
What is the subject of sentence?
What are nouns?
What are coordinate conjunctions?
What are correlative conjunctions?
What is subject-verb agreement?
Using a singular or plural verb with or, either/or, and neither/nor
Ending a long, compound subject with a comma
Glossary of grammatical terms
Click on the one with a compound subject:
It is possible to end a compound subject with a comma to group it neatly for your readers. This is not a popular practice amongst grammarians. However, if you think it helps, do it. For example: