Not only...but also

Not only + auxiliary + S + V, but S also + V (Not only did costs rise, but productivity also fell.)

Never / Rarely / Seldom

Never/Rarely/Seldom + auxiliary + S + V (Never before has the company posted such results.)

Hardly / Scarcely

Hardly/Scarcely + had + S + PP + when + S + past simple

No sooner

No sooner + had + S + PP + than + S + past simple

Only after / Only when

Only after/when + clause/phrase + auxiliary + S + V

Not only did costs rise, but productivity also fell.

Never before has the company posted such impressive results.

Rarely does the CEO attend departmental meetings.

Hardly had the contract been signed when problems arose.

No sooner had she submitted the report than the client requested revisions.

Only after extensive testing was the product approved for release.

Seldom have we seen such a significant improvement in one quarter.

Little did the team know that the project would be cancelled.

Not only was the budget exceeded, but the timeline was also missed.

Only when all checks are complete can the system go live.

Not only sales rose but profits also increased.

Not only did sales rise, but profits also increased.

'Not only' at the start requires subject-auxiliary inversion: 'Not only DID sales RISE'.

Never the company has posted such results.

Never has the company posted such results.

After a negative adverbial, the auxiliary comes BEFORE the subject.

Negative Inversions

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