What is the fundamental grammatical trick used to distinguish an Adverbial Clause of Place from an Attributive (Relative) Clause ?

Question

What is the fundamental grammatical trick used to distinguish an  Adverbial Clause of Place  from an  Attributive (Relative) Clause ?

Accepted Answer

Adverbial clauses modify a verb and have no noun preceding them, while relative clauses modify a preceding head noun.

Answer

Relative clauses are never preceded by commas, while adverbial clauses always require them.

Answer

Adverbial clauses can be non-finite, whereas relative clauses must always contain a tensed verb.

Answer

Adverbial clauses must always use "wherever," while relative clauses use "where"

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