"I know there are mistakes, but an editor can fix it. That's what editors do, isn't it?" While I was doing a Q & A on a radio station, a caller said those words.
Yes, that is what editors do—after they accept a manuscript. They expect well written, grammatically correct submissions. Their job is to improve a good manuscript and make it into an excellent one. As a professional, I'd be ashamed to send anything to an editor that was less than my best work.
"I want to write good," one woman said at a writers conference. (She should have said well.) "But if I spent all my time learning to spell and write better English, I wouldn't get any good writing done."
"I wouldn't hire a carpenter who didn't know how to use a hammer," I replied. "Good writers know their craft—that's their box of tools. If you don't know sentence structure, learn before you submit."
She shrugged and walked away.
Professional writers take pride in presenting quality manuscripts;
those who don't care remain amateurs.