Definitions:

Subject: A noun or pronoun that is the "topic" of the sentence.  It tells who or what does the action or "is" (state of being).

Verb: An action word or state of being (existence) word.

Compound: Two or more (in science, a compound consists of using two or more elements together, such as H2O [water]).  In English grammar, when we have two or more subjects, two or more verbs, two or more direct objects, etc, we say that they are compound subjects, compound verbs, compound direct objects, and so on.  The compounds are generally joined by just a coordinating conjunction (and, or, nor, but, yet), or by correlative (paired) conjunctions like: both - and; neither - nor; either - or; etc.  Sometimes they are separated by other words, so you have to look carefully for the compounds.

Examples:

Both Mary and John will go to the dance tonight.
Compound subject: Mary, John -- joined by a correlative conjunction, both - and

Either Joe or Sam will paint the mural for the gym and then start the one for the art room.
Compound subject: Joe, Sam -- joined by correlative conjunction, either - or
Compound predicate or compound verb: will paint, start -- joined by the coordinating conjunction, and.

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1. Gary and John practiced a piano duet for tomorrow's concert.
2. Emma turned slowly but replied with a loud voice.
3. Most dogs and cats make good house pets.
4. The sun appeared this morning and then disappeared this afternoon.
5. The ducks swam to the island and sat on the shore.
6. Both the store on my corner and the shop next door to it closed today.
7. All of a sudden, our dog ran to the door and listened intently.
8. The carpenters measured and cut the wood.
9. Cheryl and Mark went to Florida for their vacation and visited relatives.
10. The kettle gurgled and sputtered on the stove.