Anonymous I really don't understand why 'by' isn't a conjunction The -ing form when used without an auxiliary verb is not considered a finite verb form. "moving" and "flipping" in your examples are called gerunds, a sort of hybrid between a verb and a noun. Gerunds are never considered "main verbs".
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AnonymousI really don't understand why 'by' isn't a conjunctionThe -ing form when used without an auxiliary verb is not considered a finite verb form. "moving" and "flipping" in your examples are called gerunds, a sort of hybrid between a verb and a noun. Gerunds are never considered "main verbs".
Anonymous'She made a sound by moving her" mouth.' 'He decided by flipping a coin.'"by" is a preposition in the sentences. It is followed by a verbal noun, gerund, (a noun-like form derived from a verb).