who does the old man "depend on"请问depend后为什么不加s

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who does the old man

who does the old man "depend on"请问depend后为什么不加s
who does the old man "depend on"请问depend后为什么不加s

who does the old man "depend on"请问depend后为什么不加s
WHO是主语,不加S,只有在第三人称单数时加S