请将下面的句子（主动语态）改为被动语态：

题目

请将下面的句子（主动语态）改为被动语态：
We have put off the meeting till next Monday.
We must pay more attention to the passive voice of English verbs.

答案

The meeting has been put off(by us)till next Monday.
More attention must be paid(by us)to the passive voice of English verbs.