[译] 俚语常常流行得快，过时得也快。
[误] Slangs often go in and out of fashion quickly.

[正] Slang often goes in and out of fashion quickly.
[注] slang 是不可数名词，没有复数形式，所以词尾不能加 s，谓语动词也应该用单数形式。