〜だけでなく

About

～だけでなく(～も) combines だけ (only), でない (is not), and an optional も to express "not only X, but also Y".

でない can also be written in its "full" form as ではない, and although it is common to drop the は for this grammar point, both forms are considered correct.

Nouns, verbs, and い-adjectives can attach to ～だけでなく(～も) directly, but な-adjectives must attach with な.

～だけでなく(～も) may also follow particles/adverbial particles such as も/から, and in formal speech "nounであるだけでなく(～も)" is common.

It is also possible to add て to the end (だけでなくて), this sounds slightly more like spoken language, although both patterns are used in both written and spoken Japanese.

Compared to regular "and" statements made with the も particle, 〜だけでなく(～も) statements place more emphasis on "X as well as Y".

Summary

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  ～だけでなく(～も) means "not only X, but also Y"

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  ～だけではなく(～も) is also possible, but the は is often dropped

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  な-adjectives must attach to ～だけでなく(～も) using な

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  〜だけでなくて is also possible and sounds slightly more like spoken language