这个句子变成被动语态,怎么变?someone must have turned on the light without your notice.
这个句子变成被动语态,怎么变?
someone must have turned on the light without your notice.
The light must have been turned on without your notice.
someone变宾语可以省略
must have done 变被动 must have been done
宾语变主语
状语照抄
The light must not be turned on without yoru notice
The light must have been turned on without your notice（by someone）.
the light must have been turned on without your notice.
被动语态的构成：be + 过去分词,只要把 be 按照各种时态要求改变就会成为被动语态.一般现在：is/are/am + 过去分词一般过去：was/were + 过去分词一般将来：will be + 过去分词过去将来：would be + 过去分词完成时...
The light must have been turned on without your notice.
上边一楼的会不会啊就乱写。你那是么！都说绝对不可一关灯了！！！这么答题误人子弟啊。
The lights had been turned on without your notice.
你要是愿意，后面加上个by someone 也行。一般不用。这种主语算是understood 的。