被动be to be closed与be closed的区别

The shop is to be closed now是被动语态.为什么不用The shop is closed now同样被动语态
为什么前者加to be?不是一样的吗

be +不定式(to do):应该,打算,将要
be to be closed应该(要)关闭; be closed 被关闭了。
The shop is to be closed.这个商店应该(要)关门了。
The shop is closed. 这个商店关门了。
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