I would like to see the sentence in which "how" is used and is causing you concern. The interrogative word "how" is not a relative element, but usually a subordinator in a dependent clause: Do you know [how they opened the gate]? The bracketed part is called an interrogative content/embeded clause in modern grammar ('noun clause' in traditional terminology), and functions as the complement of the verb "know".
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I would like to see the sentence in which "how" is used and is causing you concern.
The interrogative word "how" is not a relative element, but usually a subordinator in a dependent clause:
Do you know [how they opened the gate]?
The bracketed part is called an interrogative content/embeded clause in modern grammar ('noun clause' in traditional terminology), and function
Sandip Kumar * Relative pronoun : who, whom, whose, which, that* Relative adverb : when, where, why
Is 'how' neither a relative pronoun nor an relative adverb? Then, which category 'how' belong to?
We answered this question in another thread.