The sentence I saw in a book is below.
The boy yelling is my brother.
I suddenly wonder why yelling is modifying from behind the sentence . I believe The yelling boy is my brother. is all right.
Please tell me the difference.
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If you expand the sentence, it could be "The boy who is yelling is my brother". The attributive clause starting with WHO can be replaced by a present participle, yelling. That is why you see the sentence that you posted.
It seems to me "The yelling boy is my brother" will work too, but it doesn't sound as natural.