In English attributive clauses, how to judge antecedents, what components are missing and what methods are there?

There is a way. Generally speaking, antecedents precede relative words. If you are not clear, you can refer to the predicate verb in the clause to judge. For example, she is a girl with whom everyone wants to talk. (Girl is the antecedent and all nouns, that/who is a relative word, what is not a relative word, and th ... this is an attributive clause. In a clause, everyone is the subject and wants to talk to the predicate, and there is no object, so the antecedent is the object in the clause.