Just as there can be compound nouns and sentences, there can also be compound subjects and compound predicates. By the very word compound we can know that a compound subject and predicate must be a mixture of many elements of the syntax.

A 'compound subject' is made up of two or more simple subjects that are joined by a conjunction and have the same verb. Coordinating and correlative conjunctions are commonly used to join the subjects in a compound subject.

For example: "'Books' and 'magazines' are sold at the new store." "'Water' or 'soda' will be served with dinner." "Neither the 'bus' nor the 'subway' goes there." "Both 'experience' and adequate 'training' are necessary."

Where there are more than two subjects in the compound subject, the conjunction is usually used only between the two last words, and the words are separated by commas. e.g. "Crimson, cerise, and vermilion are shades of red."

Come sentences have more than one simple predicate. A 'compound predicate (or compound verb) is made up of two or more verbs or verb phrases that are joined by a conjunction and have the same subject.

Sonme examples are: "Artists 'draw' and 'paint'." "Yvette 'sat' on a bench, 'opened' her lunch box, and 'ate' a sandwich." In compound verbs that contain verb phrases, the auxiliary verb may or may not be repeated before the second verb. e.g. "Cats 'will hiss' and 'will scratch' when frightened." or "Cats 'will hiss' or 'scratch' when frightened."