A proof Ajeet would be in the standards imposed by the numerous article directories. Mine for example will not tolerate misspelling, but lower quality standards of terminology are acceptable. The average reader reads at eight grade school level, a Kincaid analysis (free in Word) will give this. However other quality standards must be obtained such as minimum 500 word article length, and placing an article in the correcting category. So if an article is rejected by an article directory it will never reach the search engines. Likewise unless you are a professional career article writer, content placed on a website with PR ) or PR1 will receive very little search engine attention. I currently reject 44% of all articles submitted, rarely because of lower quality English. However if that writer submits 100 articles, then a warning to improve language skills would be given. So even without evasive Google proof, a lot of writing gets stopped dead in its tracks.