[文法] 分詞構句

[arcadia (arcadia)]

前面有一篇板友h10840206提到的文法問題,
在推文裡面dunchee大大提到
https://tinyurl.com/ofbow69
因為我有疑惑,所以另起一篇發問.

連結是BBC的World Service的Learning English的最下方
A participial clause, staring with -ing is used
instead of a relative pronoun plus active verb,
continouous or simple.

eg. The train now arriving (=which is now arriving)
at platform 1 is the 6.36 from Newcastle.
...

Note that when we are talking about
a single completed action in a defining relative clause,
we cannot use an active participle:

eg. The girl whol fell down the cliff broke her leg.
(Not: The girl falling down cliff...)

我的疑惑是,我覺得火車的例句和女孩子的例句沒什麼差別,
都是defining,為什麼一個可以改成-ing,一個卻不可以呢?
請指點迷津,謝謝.

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※ 文章網址: https://www.ptt.cc/bbs/Eng-Class/M.1518942053.A.E37.html
推 kangan987: 你的貼文回答你了啊..
→ kangan987: a single completed action
→ dunchee:  goo.gl/VuHDk7
推 cywec: 你把第二句改成ving還原回去看會發生什麼事
非常謝謝!
※ 編輯: arcadia (118.169.228.185), 02/20/2018 16:55:19
→ sunny1991225: 動作有沒有完整的差別，如此而已