不但 + Clause A, 而且(也/还) + Clause B
不但...而且... (búdàn...érqiě...) — 'not only...but also...'
不但...而且... stacks a second, stronger or additional fact on top of the first — 'not only A, but also B', where B usually escalates or reinforces A: 她不但漂亮，而且很聪明 (she's not only pretty, but also very smart). If both clauses share the same subject, 不但 comes AFTER the subject (她不但漂亮...); if the two clauses have different subjects, 不但 comes BEFORE its own subject, right at the start of the clause: 不但他去了，而且他妹妹也去了 (not only did he go, but his sister went too). 而且 is often reinforced with 也 or 还 right after it. The deciding question: is the second fact simply additional/stronger information about the same topic (→不但...而且...), and does each clause have its own subject or share one — that decides where exactly 不但 sits.
Examples
- 她不但漂亮，而且很聪明。tā bú dàn piào liang, ér qiě hěn cōng ming
She's not only pretty, but also very smart.
- 不但他去了，而且他妹妹也去了。bú dàn tā qù le, ér qiě tā mèi mei yě qù le
Not only did he go, but his sister went too.
- 这家饭馆不但便宜，而且菜做得还特别好吃。zhè jiā fàn guǎn bú dàn pián yi, ér qiě cài zuò de hái tè bié hǎo chī
This restaurant isn't only cheap, its food is also especially delicious.
Common mistake
✗ Wrong: 他不但去了，而且不但他妹妹也去了。
✓ Right: 不但他去了，而且他妹妹也去了。
When the two clauses have different subjects (he vs. his sister), 不但 belongs at the very start of its clause, before that clause's own subject — not repeated or placed after the first subject.
Practice this pattern
Fill in the missing character:
她＿但漂亮，而且很聪明。
She's not only pretty, but also very smart.