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"It is unreasonable to regard any language as the possession of a particular nation, and with no language is it more unreasonable than with English."

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Sounds OK to me. What's your question, Minhuoc?
Oh, I don't understand the sentence underlined. Sorry.
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Oh, sorry. I don't understand the sentence underlined.

Thanks.
Tthe language it is most unreasonable to think of as belonging to only one nation, is English.

We are unreasonable if we do not think of English as belonging to many nations.
It's an interesting structure. I suppose "with" means "in the case of", in such examples.

MrP
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Minhuoc"It is unreasonable to regard any language as the possession of a particular nation, and with no language is it more unreasonable than with English."

Thanks.
Grammatically flawless........ semantically superb.