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From the google's point of view correct grammar and spellings are not very important which is evident from the fact that most people who are into cloaking use random text with keywords inserted into it as spider food and they appear to be doing just fine in SERPs.
Thanks iThink, even i think that from SE point of view the grammer hardly matters. But you never know as google might want the customers to get good english.
Though tough to do but not impossible.
Aji