I can't speak English. When I write articles that only Japan language.If if I wrote articles in English, I speak English and may write a comment, or friend requests people have made the mistake.
I can not speak English. I use only Japanese when I write an article. If I wrote the English version of the article, people that I was a misunderstanding and speak English might or write a comment you can request friends.
I can't speak English. I use Japanese only when writing an article. If I were at when writing articles in English, for a friend who can speak English to me that I may write a comment or not.