don't study

Vật sống: cây bàng, cây phượng, cây đu đủ, con chó, con mèo, .....

Vật không sống: cái bàng, cái máy tính, cái ghế, ....

1. The doctor advised him to stay in bed for a few days.

→He was advised to stay in bed for a few days by the doctor

2. I regretted not telling him what happened last night.

→I wish I had told him what happened last night.

3. He hasn't been back to his village for over 20 years.

→It's over 20 years since he went back to his village