After he had dried his face, and not knowing what else to do, dried it again, the boy turned around, wondering what next.
In the above sentence why do the writer use gerund (knowing and wondering) is used instead of (known and wondered)?
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The present participle (gerund) can be used instead of a phrase starting with as, since, or because. In this usage the participial phrase explains the cause or reason for an action. It is because he didn't know what else to do that he dried his face again.