6格和4格。

[Johny]

2017.04.14从同呼 Johny,
1. I failed to see the wall (you had previously talked to me about)
2. стенЫ  I didn't see a wall (any wall)
стЕны I didn't see walls/the walls

so, in this case the Accusative case is used to refer to particular nouns and the Genitive case is used to modify non-particular nouns, right?

[Johny]

2017.04.15wusong As you wish  

BTW, in modern russian internet-slang there exists a phrase "Убей себя об стену с разбега!" ("You must kill yourself by running-up and running into the wall!")  

such a positive phrase! i love it

[从同呼]

2017.04.15Johny so, in this case the Accusative case is used to refer to particular nouns and the Genitive case is used to modify non-particular nouns, right?

Yes, this is one of grammar ways to show theme-rheme relations (already known/new information) in the sentence. In Russian, word order and noun cases (sometimes plural number) is used, while in English you use articles and word order.

[Johny]

2017.04.15从同呼 Yes, this is one of grammar ways to show theme-rheme relations (already known/new information) in the sentence. In Russian, word order and noun cases (sometimes plural number) is used, while in English you use articles and word order.

oh I see
thank you for your help

[yf12]

Johny,

Цитата:настолько и таким есть разница?

Нет

[r1]

Johny,

Цитата:вы учитель русского языка?

Прошу прощения, что не сразу ответила. Нет, я не учитель русского, я китаист, как и большинство форумчан

Цитата: в ТРКИ это важно？

К сожалению, не знаю

Цитата:so, in this case the Accusative case is used to refer to particular nouns and the Genitive case is used to modify non-particular nouns, right?

You may want to check out this article
http://www.many-books.org/auth/9403/book/42674/roz...ravilno/read/19
It's from a book by D. E. Rosenthal who is generally accepted as the ultimate authority on Russian language in any grammar-related flame. In a nutshell: genitive is classical and sounds more bookish, accusative is more colloquial. There are patterns which call for a particular case (accusative only or genitive only), and others, where both cases are acceptable.

[Johny]

r1, спасибо.статья трудная. понял 20% 

[Johny]

что значит эти слова?
1 отмудохали (Тут-то мы с мужиками их и отмудохали!)
2 ХЗ (значит who knows?)

[东方火兔]

Johny,
1) отмудохать = 干 （要么“干活”要么“打人”，这里是后者）
2) ХЗ = хуй знает （鬼知道，直译：鸡巴知道）

[Адов]

Johny
https://ru.wiktionary.org/wiki/отмудохать
1. разг., вульг. сильно или жестоко избить, отпинать 大概意思是"痛殴"、"毒打"
2. разг., бранн. проделать, учинить, совершить что-либо   这个是解"干活"吗？

Тут-то мы с мужиками их и отмудохали!
东方火兔 不过全句又该解作什麽﹖

https://ru.wiktionary.org/wiki/хз
сокр. от хрен знает; хуй знает или хочу знать