a做某事对b来说是怎样的用英语怎么表达?

凭感觉去理解你的意思的话,可以用：
It's adj.for B that A did that thing
比如说.
“那个孩子和朋友去看电影,对他母亲来说是很欣慰的.”
就可以：It's comforting for the mother that her child went to the movies with his friends.
不知道你是不是这个意思?
再问： 谢谢，是的