i impressed on him the importance of his work...impressed 是及

因为宾语the importance of his work太长了,我们就把on him 提前了.原始句子是：
I impressed the importance of his work that / which he - - - -on him.
--------你看,on him在句子的最後,这样显得不平衡.所以on him提前了,而语法的功能没有改变.-------- impress sth on sb == impress on sb sth that - - - - -(因为sth that - - -- 太长,所以放到後面).
再问： that / which he - - - -是什么意思，原句中没有这个呀
再答： 你好。也就是说，位置的改变是由於像“that / which he - - - -”这样的短语或句子的存在。我只是举个例子。看来，你的英语语感还在培养之中。