1) Good vocabulary, knowledge of grammar, sense of style--all are basic writing skills.
There is no appositive in the sentence above. There are three noun phrases, all different. There are three different things, not the same things.
2) Basic writing skills--good vocabulary, knowledge of grammar, sense of style-- can be learned by almost everyone.
In the sentence above, there is no apposition.
Here are FumbleFingers' examples:
1) Tom, Dick and Harry, the brothers [brothers renames Tom, Dick and Harry]
2) The OP here, a new visitor to ELL [a new visitor renames the OP]
3) My Aunt, Mary Elizabeth Trosper [the name renames My Aunt]
An appositive has to RENAME a thing, but not be a completely different thing. An appositive is NOT three items starting a sentence.
Bananas, apples and oranges were on the table. [no appositive]
Bananas, an edible fruit, were on the table. edible fruit renames bananas]
Appositions can be used anywhere in a sentence to rename an existing person or thing.
- The orange man, aka the US president, is unfit for office.
- That scum ball doctor, a true pervert, molested those girls.
- A large dog, man's best friend, can be a lot of work.
- Any cat, a furry feline creature, is great for petting.
Appositives always come AFTER the noun they accompany and rename them or restate them. They are often at the beginning of sentences, but not always.
John was coming down the driveway in red RAM truck, a very heavy car.