Công thức: 

- No sooner + had + S + P2 + than + clause.

 - Hardly/ Barely/ Scarcely + Auxiliary + S + V + when/before + clause.

 - If + S + Had + V(pp)/Ved, S + would/ could…+ have + V(pp)/Ved.

19. The embassy staff little realized that Ted was a secret agent.

-> Little did the embassy staff realized that Ted was a secret agent.

20. I had hardly begun to apologize when the door closed.

-> Hardly had I begun to apologize when the door closed.

21. The shop can in no way be held responsible for customers' lost property.

-> In no way can the shop be held responsible for customers' lost property.

22. The couple had no sooner arrived than the priest started the ceremony.

-> No sooner had the couple arrived than the priest started the ceremony.

23. Tom only understood the meaning of the comment when he saw his wife's face.

-> Only when Tom saw his wife's face did he understand the meaning of the comment.

24. The restaurant cannot accept animals under any circumstances.

-> Under no circumstances can the restaurant accept animals.

25. The artist rarely paid any attention to his agent's advice.

-> Rarely did the artist any attention to his agent's advice.

Chúc bạn học tốt. ^_^

`19`. Little did the embassy staff realized that Ted was a secret agent.

`20`. Hardly had I begun to apologize when the door closed.

`21`. in no way can the shop be held responsible for customers' lost property.

`22`. No sooner had the couple arrived than the priest started the ceremony.

`23`. Only when Tom saw his wife's face did he understand the meaning of the comment.

`24`. Under no circumstances can the restaurant accept animals.

`25`. Rarely did the artist any attention to his agent's advice.

`→` No sooner + had + S + P2 + than + clause

`→` Hardly/ Barely/ Scarcely + Auxiliary + S + V + when/before + clause

`→` If + S + Had + V(pp)/Ved, S + would/ could…+ have + V(pp)/Ved