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From what I understand, a few errors usually won't be the main cause for rejection. If there are a very large number of grammatical errors, or a fair number of glaring errors, that might tilt thing...
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Source: https://writers.stackexchange.com/a/40722 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
From what I understand, a few errors usually won't be the main cause for rejection. If there are a very large number of grammatical errors, or a fair number of glaring errors, that might tilt things towards rejection. But then it depends on how good the writing is. In other words, I'd want to submit something that was "good, but not necessarily perfect" on grammar. (Of course, this doesn't apply to intentional violations of grammatical rules as a matter of style.)