被动态 be + 动词过去分词

be 各个时态的变化

一般现在时 – am / are / is

现在进行时 – is being / are being

现在完成时 – has been / have been

一般过去时 – was / were

过去进行时 – was being / were being

情态动词 will, can 等 – will be, can be 等

[一般现在时]

Am I invited too?

我也被邀请了吗？

[现在进行时]

Am I being recorded?

我正在被录音吗？

[现在完成时]

He's been hurt.

他被伤害了。/他受伤了。

[一般过去时]

房间里有几个箱子，但我们不知道箱子里有什么。（We didn't know what was in the boxes.） 

They weren't label(l)ed.

它们没有（被）贴标签。

label 动词，贴标签

[过去进行时]

They were being watched carefully.

他们正在被仔细观察。

[情态动词]

Reservations can be accepted up to 24 hours before arrival.

提前至少24小时预约。

reservation(s) 名词，预订，预约

up to 最多，最高

arrival 名词，抵达，到达（arrive 动词，抵达，到达）

up to 24 hours before arrival 不超过（不晚于*）抵达前24小时

* 这里是从距离“抵达前24小时”更早的时间点来讲，所以up to可以说成“不晚于”。“Up to”的基础意思是“最多，最高”，但在不同语境里会相应翻译成不同的中文。