Reversing word order for effect: Never have I seen..., Not only did she...
Negative adverb + auxiliary + subject + main verb
Same structure (already negative)
Already inverted
💡 Use auxiliary (do/does/did/have/had/will/would) + subject + base verb.
✓Never have I seen such beauty.
✗Never I have seen such beauty.
Invert: auxiliary (have) before subject (I).
✓Not only did she apologize, but she also paid.
✗Not only she apologized, but she also paid.
Invert after 'Not only'.
✓Rarely do we get such opportunities.
✗Rarely we get such opportunities.
Add 'do' and invert for present simple.