What it means
だけでなく means “not only X but also Y.” It adds X as one item and then presents another item, action, or quality as an additional point. X can be a noun, a na-adjective with な, an i-adjective, or a plain-form verb. The second part often contains も, but も can be omitted when the “also” meaning is clear from context.
Usage note
だけでなく usually connects to a following statement, so it is commonly followed by a comma and another clause. Do not confuse it with だけではない, which means that something is not merely limited to one thing and does not necessarily introduce a second item.
How to use it
この店は野菜だけでなく、果物も売っています。
This store sells not only vegetables but also fruit.
このホテルは便利なだけでなく、部屋も広いです。
This hotel is not only convenient, but its rooms are also spacious.
このかばんは軽いだけでなく、丈夫です。
This bag is not only light but also durable.
田中さんは英語を話すだけでなく、中国語も教えています。
Mr. Tanaka not only speaks English but also teaches Chinese.
この店は野菜だけでなく、果物も売っている。
This store sells not only vegetables but also fruit.
このホテルは便利なだけでなく、部屋も広い。
This hotel is not only convenient, but its rooms are also spacious.
このかばんは軽いだけでなく、丈夫だ。
This bag is not only light but also durable.
田中さんは英語を話すだけでなく、中国語も教えている。
Mr. Tanaka not only speaks English but also teaches Chinese.
Example sentences
この図書館は本だけでなく、雑誌も借りられます。
At this library, you can borrow not only books but also magazines.
この電車は速いだけでなく、駅の案内も分かりやすいです。
This train is not only fast, but its station information is also easy to understand.
母は料理を作るだけでなく、庭の野菜も育てています。