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