It is no use .和 It is of no use ...之间的区别?

It is no use +doing sth是现在分词里的固定搭配。类似的搭配还有It is a waste of time doing sth。和 It is of no use 。。。是be of +名词=be +形容词,如：be of importance=be important,It is of no use = It is not useful 。。。,而 It is not useful或uesless+to do sth。。。。这里只是多加了个no,看起来这两个有点相似。实际上就是It is of use = It is useful。so,understand? 再问： understand! 再答： 那该采纳我的啊。