把主动语态改为被动语态，可以遵循以下几个步骤：

1. 把宾语变成被动语态中的主语；

2. 找出谓语动词，变成相应的被动。如：一般式变成be done。过去式变成was/were done；

3. 把主语变成介词by 的宾语；

4. 注意人称、时态和数的变化。

例：1. Bruce writes a letter every week. →A letter is written by Bruce every week.

2. Li Lei mended the broken bike this morning.→The broken bike was mended by Li Lei this morning.

3. He has written two novels so far.→Two novels have been written by him so far.

4. They will plant ten trees tomorrow.→Ten trees will be planted by them tomorrow.

5. Lucy is writing a letter now.→A letter is being written by Lucy now.

6. You must lock the door when you leave.→the door must be locked when you leave.

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