she showed the airline agent her ticket c1: The airline agent..................... c2: Her ticket.........

`1` The airline agent was showed her ticket .

`2` Her ticket was showed to the airline agent .

`-` Bị động quá khứ đơn : S(bị động) + was/were + V3/V_ed + O ...

$1. $ 

$-$ The airline agent was shown her ticket

$-$ Her ticket was shown to the airline agent

$→$ Thì QKĐ: S + Ved/V2

$→$ Câu bị động thì QKĐ: S + was/were + Vpp + (by O)