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		| Originally posted by Bad_Rich_Chic Concur that it will likely be repeated, however, I don't concur that it is likely to be correctable, particularly if it is a general pattern of bad usage rather than a rarity.  The problem with bad grammar isn't so much that there is a limited series of corrections they need to learn - if that was it, they could pick up a book and sort it all out themselves, had they the desire.  The real problem is that people who routinely make these errors haven't developed a habit of critically thinking through and editing what they are going to say before it comes out.  That can't really be "corrected" by an outsider pointing out this mistake or that.
 
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  I grew up in a pretty crappy neighborhood, and went to a horrible HS. My grammar and what writing skills I may have came together in college, but mostly in my first job.
When writing quickly I would sometimes mix up then and than. Once, after doing so in an email, someone sent me a clarifying response. I was glad he did, and have not made that mistake since.