sign for在此是不及物动词+介词构成的短语动词,意为 To provide one's signature in order to receive or approve of something. 例句:Your package is scheduled to arrive tomorrow. Please be sure someone will be present to sign for it.
A: "I need a signature saying this project was approved." B: "I can sign for it."
这种短语动词如果用被动语态,就会出现介词位于句末的现象,类似于 The baby needs to be looked after. 你的句子就是被动语态,意思是你的包裹已经有人签收过了。改为主动语态则为,Someone has signed for your package.
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