Both … and Joining sentence elements with paired conjunctions

Addition

BOTH . . . AND	NOT ONLY…, BUT (ALSO)
Both X and Y join like (same word form) elements in a sentence. This is a correlative conjuction.	Not only X but also Y: join like (same word form) elements in a sentence. The verb agrees with closest noun. The focusing adverbs not only and also draw attention to particular parts of a sentence. (See focusing verbs.)This is also a coordinating conjuction.
NOUNS Both the movie and the play were good.   (plural verb form)	NOUNS Not only the movie but also the play was good.   (verb agrees with 2nd noun)
I liked both the movie and the play.	I liked not only the movie but also the play.
MODIFIERS The actors were both engaging and skillful in their performances.	MODIFIERS The actors were not only engaging but also skillful in their performances.
The plot moved both swiftly and artfully throughout the movie.	The plot moved not only swiftly but also artfully throughout the movie.
INFINITIVES & GERUNDS The directors wanted both to win and to receive recognition for their work.	INFINITIVES & GERUNDS The directors wanted not only to win but also to receive recognition for their work.
The producers ended up both extending and expanding their filming hours.	The producers ended up not only extending but also expanding their filming hours.
VERBS Ebert both likes and recommends the movie.	VERBS Ebert not only likes but also recommends the movie.
PREPOSITIONAL PHRASES The movie is being shown both at The Fox Theater and in neighborhood theaters.	PREPOSITIONAL PHRASES The movie is being shown not only at the Fox Theater but also neighborhood theaters.

theater  US-Eng; theatre Br-Eng

Not only with an auxiliary verb

NO AUXILIARY ADDED	AUXILIARY BEFORE SUBJECT AND VERB
When not only is used at the beginning of a sentence, and it joins like (same form) elements of a sentence, no auxilairy verb is used. This is a coordinative conjuction.	When not only is used at the beginning of a sentence and joins two clauses, the auxilary verb of the not only clause is placed before the subject. This is a coordinating conjuction.
WORDS AND PHRASES Not only  you   but also   I   applauded the performance.  (noun + noun) You and I applauded the performance.	CLAUSES Not only did  I applaud, but I also stood up. I applauded the performance, and I stood up.
I like not only to watch movies but also to see plays. (infinitive + infinitive) I like to watch movies and see plays.	Not only do  I like to watch movies, but I also like to see plays. I like to watch movies, and I like to see plays.

The focusing adverbs not only and also draw attention to particular parts of the sentence. (See focusing verb.)

Punctuation — Phrase vs. Clause

WORDS AND PHRASES	CLAUSES
No comma is needed when joining equivalent sentence elements: noun-noun, modifier-modifier, verb-verb or verb-phrase--verb-phrase. This is a correlative conjuction.	A comma is used when joining a dependent clause to an independent clause. This is a coordinating conjuction.
We both applauded and stood up.  (no comma) We both clapped our hands and stomped our feet.	We not only applauded, but we also stood up. (independent clause + dependent clause)
I both liked the movie and loved the play.	I not only liked the movie, but I also loved the play.

Also seeindependent clause