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Here is the sentence

Seller's (a person's name) story is of a beneficial cascade.

why there is of in the sentence, I think it is the same without the "of"

I cannot find "be of" as collocation in the dictionary. But I have seen some articles use this style

For example

Airconditioner is of no use this winter, as it is warm.

This sentence is made up by me, so it might be wrong.

Thanks for any help for analysing this.
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Hi,
Consider simpler examples.
eg Tom wore a coat of red. 'Of red' describes an attribute ot the coat.
eg Tom has a mind of average intelligence. 'Of average intelligence' describes an attribute of his mind.

You could rephrase these examples as
Tom's coat is of red.
Tom's mind is of average intelligence.

Here is the sentence

Seller's (a person's name) story is of a beneficial cascade.
ie The seller had a story of a beneficial cascade. (I don't know what this means, but the grammar is OK). Actually, in this context the word 'of' suggests more the meaning of 'about'.

why there is of in the sentence, I think it is the same without the "of"

I cannot find "be of" as collocation in the dictionary. But I have seen some articles use this style

For example

Airconditioner is of no use this winter, as it is warm.
ie Someone has an air-conditioner of no use . . .

This sentence is made up by me, so it might be wrong. No, it's not wrong.

Clive
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