It's++adj+for+sb+to+do和It's+adj+for+sb+doing的区别
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鄙人感觉:1)常用结构为It's adj for sb to do sth.做某事对某人来说怎么怎么样.如:It's important for us to learn English well.学好英语对我们来说很重要.2)It's adj for sb doing sth为少数词的固定表达.如It's no good/ no use +for sb +to do sth"做某事对某人来说是无用的"如:It's no good for you watching TV too much.(看太多电视是没好处的.)