Someone left the light on all nght.的被动语态及You must put away all your books Someone is cleaningSomeone is cleaningbuy不要
问题描述：
Someone left the light on all nght.的被动语态及You must put away all your books Someone is cleaning
Someone is cleaningbuy不要
答
The light was left on all night (by someone).其实我觉得by someone完全可以不用的
All your books must be put away （by you）.by you也没意义