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I usally revise my posts before I post them , if you are suspecting that you made spell or grammmer mistake you can use Microsft word , if not just revise them .
If you are writting a book or something important you can ask an expert in language to review it for you .
1. by carefully revising them before submitting
2. consult the Internet, or other experts in that matter ( expert jugdment )
3. if you felt that you have a paraghaph you are not sure of I suggest to remove it in odre not to lose the credability and the core message of the whole blog
What kind of mistakes?
I use profeesional programs of editing and checking spelling or grammar.Sometimes,I use rephrasing sites too.