S + V + not only + Adj/Adv/N + but also + Adj/Adv/N
S + not only + V + but also + V

“not only … but also” is used to connect and emphasize 2 words or 2 phrases at the same position.
Example:
Adj: She is not only beautiful but also intelligent.
Adv: She speaks English not only fluently but also naturally.
N: I like not only apple but also banana.
V: I not only sing well but also dance perfectly

S + V + not only + Adj + but also + Adj

Adj: She is not only beautiful but also intelligent.
She is not only rich but also famous.

S + V + not only + Adv + but also + Adv

Adv: She speaks English not only fluently but also naturally.
Bob works not only quickly but also efficiently.

S + V + not only + Noun + but also + Noun

N: I like not only apple but also banana.
He speaks not only English but also Spanish.
He visited not only France but also Switzerland.

S + not only + V + but also + V

V: I not only sing well but also dance perfectly
He not only speaks English but also Spanish.
He not only insulted her in front of her friends but also threatened to beat her up.

INVERSION

To add emphasis, we can use not only at the beginning of a clause. When we do this, we invert the subject and the verb.

Not only + V/ADJ/NOUN/ADV + but ( he/she)also + V/ADJ/NOUN/ADVVerb be/ aux (do/will/should/would /can/ could)

NOUN: Not only does he speak English but (he) also (speaks) Spanish.
NOUN PHRASE : Not only was it raining all day at the wedding but also the band was late.
Not only will they paint the outside of the house but also the inside.
Not only is he handsome but (he is) also intelligent.
When there is no auxiliary verb or main verb be, we use do, does, did:
Not only did she forget my birthday, but she also didn’t even apologise for forgetting it.

NOTE: A double negative is considered an error – a negative form after not only sound very unnatural.
Not only did she not have any experience but she also did not have relevant education
It’s better to rephrase: Not only was she lacking in experience but also in relevant education..