Difference/ in and on

Difference/ in and on
Message from ewall11 posted on 09-04-2013 at 11:13:04 (D | E | F)
Dear Sir &Madam Hello，

I am wondering why I can't use on here .

Please give us some further information about yourself, such as your knowledge on English language as you wrote your letter in French.

I am waiting for your reply .
Best Regards,
Niki Lou

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Edited by lucile83 on 09-04-2013 15:42

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Re: Difference/ in and on from notrepere, posted on 09-04-2013 at 15:20:56 (D | E)
hello

It is because the expression in English is knowledge of something.

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