Hi there - my name is Nicholas,
I could just the Freelancer you are looking for - I am a qualified UK teacher and have excellent skills in all aspects of English language!
Please note that as a native English native speaker I am fully qualified and experienced in grammar, vocabulary, sentence formation and sentence correction (proficient in USA/AUS/UK/CAN English).
My Freelancer CV and portfolio gives you a fuller view of my experience and qualifications, but if you still have any further questions to ask me then please feel free to go ahead. I look forward to your positive response and some more detail by return.
Nicholas