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When writing in English, focus on the accuracy of your grammar, vocabulary and spelling. Try to make sure that your structure and style of writing is appropriate, between formal for work and informal to a friend.
To increase your skill for writing in English, try to look at examples from skilled writers, who have made example letters or essays etc.. Remember to check your writing, to make sure that it is correct as far as possible and that the spelling etc. is correct - for spell-checkers, the auto-correct might perhaps not be always 100% accurate for what you intend to write.