doing跟to to都可以哦,it是形式主语,to do和doing的部分则是真正主语,这里没有必须是哪个的说法的.如：
It isn't easy to raise a basy.养小孩可不容易啊.
It isn't easy seeing you with someone else.看着你跟别人在一起,并不好受.
it isn't easy 后面是跟DOING吗?为什么?是因为EASY?
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是easy to do sth还是easy do sth还是easy doingsth？
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不是“it is +adj.+for sb to do sth”吗,那为什么是"he finds it easy to
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easy 的用法是easy to do sth 还是easy doing sth