Grammar Info
N4 Lesson 8: 15/18

not only… but also

It is often used together with second noun + particle も (meaning "also") in main clause.

Verb + だけ + でなく(1)
[い]Adjective + だけ + でなく(1)
[な]Adjective + + だけ + でなく(1)
Noun + だけ + でなく(1)

(1) ではなく(て)じゃなく(て)
Register Standard
使用域 一般
だけでなく (an abbreviation of だけではなく) is a common construction in Japanese which translates to ‘not only (A), but also (B)’. Sometimes the (B) statement may be left unsaid. This expression may connect to any (A) phrase that だけ would usually be able to connect to.
  • 痩(や)せために運動(うんどう)するだけでなく、食(た)べものに気(き)付(つ)けなくてはいけない
    To lose weight, not only should you exercise, but you must also be careful of what you eat.
  • 名古屋(なごや)夏(なつ)暑(あつ)だけでなく、湿気(しっけ)ひど
    Summer in Nagoya is not only hot, but the humidity is terrible too.
  • 田舎(いなか)静(しずか)かだけでなく、空気(くうき)きれい
    The countryside is not only quiet, but the air is also clean.
  • トーマス車(くるま)だけでなく、バイクボート持(も)っている
    Not only does Thomas own a car, but he also has a bike, and a boat.
The in では is not the particle , but the 助動詞(じょどうし) (auxiliary verb) in its 連用形(れんようけい) (conjunctive) form. is regularly dropped from では expressions, or it may also be changed to じゃ, for ease of pronunciation.
  • タケルピアノだけじゃなくギター弾(ひ)けると聞(き)いた
    I heard that Takeru can not only play the piano, but also the guitar.
The 接続助詞(せつぞくじょし) should follow なく, as it is the conjunctive form of the い-Adjective ない. However, the in this particular construction is very often omitted.
  • トム日本語(にほんご)だけでなくて、中国語(ちゅうごくご)話(はな)せる
    Not only can Tom speak Japanese, but also Chinese.
In writing, if there is no comma (known as a 読点(とうてん) in Japanese) after なく, the full なくて construction will be required. When a comma is present, both forms are grammatically correct.
  • 角(かど)あるラーメン屋(や)おいしだけでなくて量(りょう)多(おお)
    The ramen shop on the corner is not only delicious, but the portions are large too.
Slow Male
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Not only me, but also my friends can speak Japanese.
That person can speak not only Japanese, but also Korean, Chinese, and Thai.
Johnny Depp has not only visited Canada, but has visited Japan as well.
[DBJG] A Dictionary of Basic Japanese Grammar
Page 97