Not only ..... but also (không những ... mà còn)
Robert is not only talented but also handsome. (adjective-adjective)
He writes not only correctly but also neatly. (adverb-adverb)
She can play not only the guitar but also the violin. (noun-noun)
She not only plays the piano but also composes music. (verb-verb)
*Note: Thành phần sau but “also” thường quyết định thành phần sau “not only.”
Incorrect: He is not only famous in Italy but also in Switzerland.
Correct: He is famous not only in Italy but also in Switzerland.