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Grammar is really important as it is the very basic of writing
Very important. You will get jobs if your grammar isn't good and if you're talented. However, you'll never get to top publications or acquire good rates if your language is poor. I always advise taking language courses before trying to knock the doors of big publications or production houses.
in scale1-10 I give grammer7 in importance , many writers use editors and reviewers who review their work