The light in the room must be turned offThe light in the room must be turned off before you leave .为什么要用must be 不是填must turn off

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The light in the room must be turned offThe light in the room must be turned off before you leave .为什么要用must be 不是填must turn off

The light in the room must be turned offThe light in the room must be turned off before you leave .为什么要用must be 不是填must turn off
The light in the room must be turned off
The light in the room must be turned off before you leave .为什么要用must be 不是填must turn off

The light in the room must be turned offThe light in the room must be turned off before you leave .为什么要用must be 不是填must turn off
因为灯不能自己关必须得人为的关掉,所以得用被动语态

灯是需要被关

被动

因为灯是主语,到灯必须由人来关闭。时刻记得按照主谓宾的结构来。