Correlative Conjunctions
Some conjunctions combine with other words to form what are called correlative conjunctions.
They always occur as a pair of phrases, joining various sentence elements that should be treated as grammatically equal and given parallel structure. The most familiar of these is the "either - or (neither -nor)" phrase because it includes common coordinating conjunctions as well.
Other correlative conjunctions, however, are frequently relied upon to coordinate complex ideas with parallel structure:
both ... and
"It is difficult to produce a television documentary that is both incisive and probing. . ." (Rod Serling)
(n)either ... (n)or
"In Hamlet, Polonius said, 'Neither a borrower nor a lender be' ”
as much ... as / [not so] much ... as
"It's as much a problem of skill as a matter of confidence."
whether ... or
Whether you win this race or you lose it doesn't matter.
not only ... but (also)
She led the team not only in number of wins but also by virtue of her enthusiasm.
as ... as
Comic Con brings as many anime enthusiasts as it does science fiction nerds.
just as ... so (too)
Just as the moon revolves around the Earth, so too is my devotion to my Love.
no sooner ... than
No sooner had we raised anchor than the fluke of a whale broke the surface of the water.
Combinations of other comparative adjectives can be used like correlative conjunctions to identical effect. Such adjectives include: more, less, fewer, further, farther, lower, higher, greater, etc.
The more you know about HIV, the less you are likely to be infected.
DIAGRAMMING CORRELATIVE CONJUNCTIONS
Diagramming a correlative conjunction is really no different from diagramming a coordinating conjunction. It all depends on whether they are being used to juxtapose two or more clauses, or two or more compound elements in a sentence.
Not only did they repair the cracked windshield,but also they replaced the door panel, which was not so much inconvenient as costly.
Note: Ordinarily, the Relative Pronoun “which” would take just one clause as its antecedent. In this sentence, it takes the two parallel clauses juxtaposed by the correlative conjunctions. This is shown in the diagram with the use of large brackets.
PARALLELISM
Diagramming a sentence using correlative conjunctions allows you to see where parallel structure is needed, because both halves of the correlative conjunction must use the same parts of speech in the same order if they are to present a balanced correlation.
Not only did they repair the cracked windshield, but also the door panel, which was not so much inconvenient as costly.
In this version of the example, "[they did] repair the cracked windshield" is not parallel in structure with "the door panel," for the obvious reason that one is a clause and the other is a noun phrase. This can be resolved either by building the noun phrase into a full clause, or by moving the correlative conjunction so that it correlates two noun phrases that are parallel to each other:
They not only repaired the cracked windshield, but also replaced the door panel, which was not so much inconvenient as costly.
Keep in mind that the point of a correlative conjunction is to make things simpler and logical. Juxtaposing two or more words, phrases or clauses can become confusing, but correlating helps to streamline the process. There’s more than one way to skin a cat, though. (Please forgive the gruesome platitude!) In many cases, writers can choose to expand or contract the correlated parts, and even deconstruct the correlative conjunctions. After all, words such as “not only” and “also” are adverbs in their own right, and they can be treated as such. Here are two alternative versions of the above-mentioned exampled, with diagrams to show you how the correlative conjunctions have been deconstructed. In this first alternative version, the correlative conjunctions “not only…but also” and “…so much as…” are deconstructed.
The first correlative conjunction, “not only…but also,” becomes the coordinating conjunction “but,” and the second correlative conjunction, “…so much as…” becomes a comparative subordinating conjunction “as.” The result is a compound-complex sentence (a sentence with two or more independent clauses and at least one subordinate clause). Take note of two things: 1) where the adverbs from the correlative conjunctions (“not,” “only,” “also,” “so,” “much”) end up on the diagram; and 2) how the relative clause containing “as” has been expanded into two, restoring the subject pronoun and linking verb to “it was inconvenient.”
Not only did they repair the cracked windshield, but they also replaced the door panel, which was not so much inconvenient as it was costly.
In this next alternate version, the correlative conjunction “not only…but also” is broken up to create one independent clause with compound predicate verbs, but the correlative conjunction “…so much as…” is left as is, correlating two adjective complements. (Remember: “was” is a linking verb.)
They not only repaired the cracked windshield but also replaced the door panel, which was not so much inconvenient as costly.
Correlative conjunctions are not the only circumstances in which parallel structure should be a concern. Parallel structure is also required in comparisons and in a series of phrases. The lesson here is that, if you ever become confused about parallelism and correlative conjunctions, try to express the same idea in a few different ways. Deconstruct the correlative conjunction into its regular conjunctions and adverbs. Expand or reduce the correlated elements into other parallel arrangements to see what sounds clearest and most logical. Just remember that, in all cases, parallel structure means two or more elements look identical to each other in grammar, syntax, and parts of speech.