关于非谓语
how I regre the days--------in doing the useless work.
a wasted b having been wasted
key:a
b为什么不对？
参考答案:用b也可以，但用a好。可以参照薄冰《高级英语语法》，高等教育出版社，1990年第一版，第478页的一段解释: "有时现在分词的一般式的被动式与其完成式的被动式完全同义,皆表示已完成的动作,这时用一般式的被动式较好,例如
Being written in haste, the composition is full of mistakes. (being written 比 having been written 好)."
总之, 在意思相同的情况下,
wasted > being wasted > having been wasted
注: 1.a是过去分词短语,b是现在分词短语,
2.过去分词短语和现在分词短语 都可作定语
3.因为是短语,一般较长,都应置于所修饰的名词之后.
4.现在分词短语置于所修饰的名词之后,相当于一个定语从句,但比从句简洁,如: A little child *learning to walk* often falls.