[Grammar] Present at the meeting were Tom, Allen, and Mary.

[kadioguy]

I saw sentences like this:

Present at the meeting were Tom, Allen, and Mary.

https://goo.gl/eRggN1
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I think "Present" here is an adjective. Can an adjective be the subject of a sentence?

 

[tedmc]

The sentence is transposed from:

Tom, Allen and Mary were present at the meeting.

What is the subject of the sentence?