句型it is +Adj. +of sb + to VR ：某人做某事，讓你覺得他很....
It is nice of you to help me. It is nice of you = you are nice .. 你幫我，你人真好。
這裡..it would be rude of someone to give this as a gift 意思是「如果有人給個禮物的話(to give this as a gift)，會被認為是無禮的(it would be rude of someone)。
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