推荐回答（3个）
1.We found some jewels in a box.
被动：Some jewels was found in a box (by us).
2.Thomas Edison invented the light bulb.
被动：The light bulb was invented (by Thomas Edison).
3.People use stamps for sending letters.
被动：Stamps are used for sending letters by people.
4.Farmers grow rice in the Sonth of China.
被动：Rice are grown by farmers in the South of China.
5.He gave me a new dictionary this morning.
被动：A new dictionary was given to me (by him) this morning.
6.The boy didn't throw the stone just now.
被动：The stone was not thrown by the boy right now.
7.He doesn't operate this machine.
被动：This machine was not operated by him.
注:括号内的词可以省略。
1. The jewels in a box has been found by us.
2. The light bulb was invented by Thomas Edison.
3. Stamps are used by people for sending letters.
4. Rice are grown by farmers in the South of China.
5. A new dictionary was given by him this morning.
6. The stone wasn't thrown by the boy just now.
7. The machine was not operated by him.
1. The jewels in a box has been found by us.
2. The light bulb was invented by Thomas Edison.
3. Stamps are used by people for sending letters.
4. Rice are grown by farmers in the South of China.
5. A new dictionary was given by him this morning.
6. The stone wasn't thrown by the boy just now.
7. The machine was not operated by him.
无错误
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