有一读者问：有这样一个句子：
(1)The books can be easily found because they are marked with numbers.
我将其中的从句改为分词短语如下：
(2)Having been marked with numbers, the books can be easily found.
可我们老师说用 Marked...就行了。请问 marked 与 having been marked 在此有什么区别？
你的老师是对的。这里应用 Marked with numbers...表静态。如用 Having been marked with numbers, 则表动态，有时间性，强调动作的完成过程，在此显然没有必要。
