Here's a breakdown of what they do:
* Connect elements of equal weight: Unlike single conjunctions like "and" or "but," correlative conjunctions highlight the parallel structure of the joined elements.
* Establish specific relationships: Each pair of correlative conjunctions signals a distinct relationship between the connected elements:
* Both...and: Both elements are true or occur.
* Either...or: Only one element is true or occurs.
* Neither...nor: Neither element is true or occurs.
* Not only...but also: The second element adds to the first, emphasizing its importance.
* Whether...or: Indicates a choice between two alternatives.
* As...as: Indicates a comparison of equality.
* So...as: Indicates a comparison of degree.
Examples:
* Both the dog and the cat were hungry. (Both elements are true.)
* Either you can go to the store or I can. (Only one element is true.)
* Neither rain nor snow could stop them. (Neither element is true.)
* Not only was he late, but also he forgot his keys. (The second element adds importance to the first.)
* Whether you like it or not, we're going. (Indicates a choice between two alternatives.)
* The house is as big as a mansion. (Indicates a comparison of equality.)
* He was so tired as to fall asleep standing up. (Indicates a comparison of degree.)
Correlative conjunctions add clarity and emphasize the connection between the elements they join. They help create a more polished and sophisticated writing style.