i have been to the city three times.这个句子里three times 为什么前不加for 如果是many times或者就是times 呢

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i have been to the city three times.
这个句子里three times 为什么前不加for 如果是many times或者就是times 呢

three times 是3次而不是一段时间.提问用how many times .I have been there for three years .提问用 how long .