on Just Publishing Advice:
We are all writing so much now and for so many different reasons.
But no matter what level your writing skills are, an online grammar check is the easiest way to correct your grammar, spelling and punctuation.
Word processors such as Microsoft Word do a very poor job. They can only perform a simplistic spell check and rarely find anything more than the most basic grammatical errors.
There are many online grammar checking tools that do a much better job of offering you suggested corrections. Some even give you an explanation or examples of grammatical rules.