deepcosmos a) There is no magic number of hours for which a person should sleep. Moreover, in formal English I understand ' f or which ' after a specific antecedent cannot be replaced with the relative adverb-' when ' and also ' when ' cannot be done with ' that '.
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deepcosmosa) There is no magic number of hours for which a person should sleep.Moreover, in formal English I understand 'for which' after a specific antecedent cannot be replaced with the relative adverb-'when' and also 'when' cannot be done with 'that'.