1. Fragment: This sentence is incomplete and lacks a main clause. It contains several dependent clauses separated by commas but does not have an independent clause to make it a complete sentence.
2. Run-on: This sentence is a run-on because it combines two independent clauses without proper punctuation or a conjunction to separate them. The first clause ends with a comma, and the second clause begins with "then," which is not a proper conjunction to join independent clauses.
3. Complete sentence: This sentence is a complete sentence because it has a subject ("My grandpa") and a predicate that expresses a complete thought ("tells the most engaging stories about growing up during the Depression and fighting during World War II").
4. Complete sentence: This sentence is a complete sentence because it has a subject ("it") and a predicate that expresses a complete thought ("was an eerie day in terms of bad weather, dark clouds, and subtle rolls of thunder").