Article writing?

That’s something you just have to improve upon yourself, practice practice practice! You can also hire article writers and study their ways, it might help.

Keep reading good blogs and articles on internet,read newspaper daily,everyday try to learn some new words from dictionary.Try speaking in English as much as possible to improve your fluency

Regardless of how irritating Microsoft Office is it is still the best form of medium to improve your writing skills and look for what really went wrong when it gives Grammatical Error. You can also try getting it proof read by people you know or the local librarian.

Watch movies with English subtitles.

Get some English speaking friends.

Use forums like these where you’d expect the English to be reasonably good to see writing examples.