compared 和 comparing在句子中怎麼用啊？

compared 表示被動含義
comparing 表示主動含義

1. Compared with your classmates, you don’t study enough.
主句主詞 you 和 compare 是被動關係，即: (you are) compared with your classmates. 所以用compared with。

2. Comparing Option A with Option B, he chose A.
如果主句主詞 you 和 compare 是主動關係，就可以用comparing。

-ed vs. -ing participle clauses (分詞從句):
1. http://www.rainschool.com/school-of-english/writing-training-levels-3-5/advanced-writing/explaining-ing-present-and-ed-past-participle-clauses-e5-08w/
2. http://www.bbc.co.uk/worldservice/learningenglish/grammar/learnit/learnitv305.shtml
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compare with, compare to 的區別

1. To “compare to" is to point out or imply resemblances between objects regarded as essentially of a different order; that is, to point out their similarities.

2. To “compare with" is mainly to point out differences between objects regarded as essentially of the same order.

有兩件事物相互比較時，要注意介系詞的用法。一般來說，可用「compare A with/ to B」的句型，此時with和to都可表「與…相比」；但有時「compare A to B」是表「比喻」，不可混淆。

“Compare A with B" 的意思是「把Ａ和Ｂ作出比較」：
We should not compare apples with oranges as they are completely different.
(把蘋果跟橙作比較是沒有用的，因為它們跟本完全不同。)

“Compare A to B" 的意思則是「把Ａ比作Ｂ」：
Eric compared his wife to the Devil.
(Eric (not me) 把他的妻子比擬為魔鬼。)

compare所有的用法 http://blog.udn.com/trjason/1595523

Sources:
http://wenda.tianya.cn/question/0634d866381f1b0c
http://blog.udn.com/trjason/1595523
http://www.dailywritingtips.com/compared-to-or-compared-with/