单独一个be,没法看出来
被动语态形式,因为被动语态对应的是各种时态句子的被动语态。
例如:
一般现在时be的形式am/is/ are:
The dog is caught.这条狗被抓住了。
现在进行时态 be的变化:am/is/ are being
A new hospital is being built
现在完成时态be的变化:has/have been
The report has been finished.
一般过去时态be的变化:was/were
The project was completed last month.
The prizes were gained by the excellent players.
过去完成时态be的变化:had been
That job had been done before they ariived.
祝你开心如意!