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What are the uses of this structure?

I looked for about it, but I couldn't find something useful.

Can you give me a definition and some examples?

John Mars
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1 Answers1

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If you are asking about such lines as these:

They are said to be wealthy
She is said to be very beautiful

they mean,

I hear (or I've heard) they are wealthy 
People say she is very beautiful

Other examples:

The house is said to be haunted
He is said to be in prison
Prisons are said to be overcrowded 
It is said to be the oldest tree in Scotland

We also say:

They say he's ill
I gather he's getting better