Using inversion after negative adverbials like hardly, never, at no time, only when, etc.
Level C1 • 10 questions
1. Only after the meeting ___ how serious the situation was.
2. Under no circumstances ___ this door to be left unlocked.
3. Hardly ___ the room when the fire alarm went off.
4. Not until much later ___ the real reason for his behaviour.
5. Seldom ___ such an impressive performance.
6. No sooner ___ the announcement than people started complaining.
7. Rarely ___ such a challenging exam.
8. At no time ___ to sign any legal documents.
9. Only when the storm stopped ___ the mountain.
10. Little ___ that this decision would change his life completely.