It will be difficult for a robot to do the same things as a person .for a robot 是什么成分?状语?补语?为什么?

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It will be difficult for a robot to do the same things as a person .for a robot 是什么成分?状语?补语?为什么?
It will be difficult for a robot to do the same things as a person .for a robot 是什么成分?
状语?补语?为什么?

It will be difficult for a robot to do the same things as a person .for a robot 是什么成分?状语?补语?为什么?
作状语.It是形式主语.

你好。
在 for a robot to do the same things 中,
1 for a robot 是to do the same things 的执行者/ 施动者,a robot是for的介词宾语,
2 to do the same things 是真正主语,it是形式主语,will be是动词谓语,difficult是表语。