compared vs comparing 用法

[admon (睡夢中)]

Ned's build was strong and tall compared to his own shorter, wiry one.


兩個人的體格比較，這原句的compared可以改用comparing嗎？要如何理解文法，何時用-ed 與何時用-ing 呢?

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推 jtmh: 體格不會主動比較，是被拿來比較
推 AirOctopus: 不行，compared這裡算被動，Ned’s build was tall (w
→ AirOctopus: hen) compared (by some observers) to his.
推 AirOctopus: Comparing Ned’s tall build to his own, his was sh
→ AirOctopus: orter.
→ AirOctopus: 前面comparing例子是He compares Ned’s build to his
→ AirOctopus:  own,是主動。
→ admon: 終於弄懂了，不懂好久，感謝解惑
→ AirOctopus: 上面(by some observers)是(by himself)才對，打錯