N3
ばかりでなく
Not only…but also, As well as
彼は仕事ばかりではなく、家事もちゃんとやっています。
Not only does he work, but he also takes care of the housework properly.
Explanation
「ばかりでなく」 means 'not only... but also...'. The effect or quality is not limited to what was named, but spreads to a wider, deeper or more extreme range. The second half often has 「も」, 「まで」 or 「さえ」. It follows a noun or the plain form (na-adjective+な): 「親切なばかりでなく、頭もいい」 (He is not only kind but also smart). It is more formal and weighty than 「だけでなく」, often with surprise or emotion.
Mixed up with
「ばかりでなく」 and 「だけでなく」 both mean 'not only... but also...'. 「だけでなく」 is more neutral and everyday. 「ばかりでなく」 is weightier, often with strong surprise or emotion, and the second part is often unexpected.
A noun goes directly before 「ばかりでなく」 with no 「の」 or 「な」. A na-adjective needs 「な」: 「親切なばかりでなく」. Fill-in questions often use this trap.