(1)it is important to sb to do sth =在某人看来做某事是很重要的(强调主观上的观点认为)
It is important to him to learn English well.
=In his opinin,it is important to learn English
在他看来学好英文是很重要的。
(2)It is important for sb to do sth=做某事对某人来说是很重要的。(强调客观存在)
It is important for him to learn English well.
学好英文对他来说是很重要的。
建议提问网友使用第2种结构。
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