1. The Walt Disney Studios, the famous movie company , has produced hundreds of cartoons for children.
⇒ Hundreds of cartoons for children have been produced by the Walt Disney Studios, the famous movie comany.
- Bị động hiện tại hoàn thành: S + have/has + been + Vpp.
2. After she had left station , we came.
⇒ By the time we came, she had left station.
- By the time + quá khứ đơn, quá khứ hoàn thành.