It's nice of you helping me so much helping 的成分是什么?

It,s very nice of you,中文, It's very nice of you It's nice of you to say It's nice of you to help it's very nice of you同义句 It's very nice of you 的中文 英语 it's very nice of you的回答 It's very nice of you 改为同义句 it's very nice of you ----(say) so It's really nice of you.Nice to meet you.区别 It's very nice ( )you. That's nice of you it's very nice of you.同意句 以 it‘s very ____ ____you.填写 It's nice of you to bring me the newspaper .of you是什么成分呀? it's nice of you 语法上怎么分析 ,of you 做什么成分呢? It's nice of you to do that 为什么用of 而不用for It's very nice of you to write to me,为什么用of It's really nice of you to say so.中文意思?为什么用of不用for?