It's really nice of you to say so.中文意思?为什么用of不用for?

It's really nice of 如题 it's really nice out. It's really nice of you.Nice to meet you.区别 It's really nice of you to say so.中文意思?为什么用of不用for? it's really nice ________you to help meA.for B.of C.to D.with it's __ nice of you to help him.填truly还是really,为什么? 连词成句,to,me,talk,of,it's,really,you,nice,to it's a really nice day @ the end of a happy wedding 英语语法 It's really nice of youIt's really nice of youIt's nice of you都有这样的说法吧,想请问这儿of的用法似乎不合语法,请问如此解释为好 really和truly的区别?it 's really nice of you.是用really吗,用truly行吗,为什么?请举个truly的例子 英语翻译翻译it is really nice of you say so it's —— nice of you to help him.a.true b.truly c.real d.really 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 nice of sb to do it's really nice to have a conversation with youand that you're really listening.