因为他对我很重要用英语怎么说

"He is important to me" 是表达这个意思的常用说法。

其中 "important" 是形容词，意思是重要的。

例句：

He is important to me. 他对我很重要。
She is important to her family. 她对家人很重要。
My job is important to me. 我的工作对我很重要。

其中 "to me" 是介词短语，表示对某人很重要。

"He is important to me" 可以说成 "He means a lot to me" or "I value him very much".