be waste of 和be a waste of区别

没有be waste of这个短语,一般都是a waste of...
waste用法如下：
1. 名词
1）垃圾/废弃物
如：The river was thick with industrial waste.
这条河里淤积了工业废物.
2）浪费/糟蹋
固定短语：a waste of...；固定句型：It's a waste of... doing sth
It's a waste of time waiting any longer.
再等下去就是浪费时间.
2. 及物动词：浪费/消耗
固定句型：waste some time (in) doing sth
Don't waste too much time playing computer games.
不要浪费过多时间打电脑游戏了.
3. 形容词：废弃的/无用的
He makes a living by gathering waste bottles and paper.
他靠收捡废纸非瓶子谋生.

有。 waste作名词时，既可数又不可数。例如：be a waste of time/money; be waste of water.意思上没有区别。都是 ···的浪费