it useful to it is useful to用法区别 请具体点哦!

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it useful to it is useful to用法区别 请具体点哦!
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it useful to it is useful to用法区别 请具体点哦!
it useful to it is useful to用法区别 请具体点哦!

it useful to it is useful to用法区别 请具体点哦!
i think it useful to do sth 用在动词后面
it is useful to do sth 直接是主语谓语