DTNg said:
It's a pet peeve. Not as bad as those who write "they" when they really mean "he" or "she", but it comes close.
How acceptable is it to start a sentence with "And" or "But"? When one of my writers do this, I edit it out. I wonder if I'm being too nitpicky and old fashioned?
In formal writing, starting a sentence with a conjunction is often considered a bad thing, though some of the best formal writers have violated this "rule" often. In any other types of writng, however, it's perfectly acceptable, and is, I think, a good thing, as long as it's not overdone. AND in formal writing, it's considered bad grammar to use a contraction, as well. But you wouldn't edit out contractions in fiction, would you? Or in any form of conversational writing?
I don't believe I'd want to read fiction where the writer never started a sentence with a conjunction, particularly in thought or dialogue. It simply isn't realistic, and never has been. Conversational writing, which means a great deal of fiction, column writing, personal essay writing, etc., needs the occasional "and" or "but" at the beginning of a sentence. It's all about realism, convenience, and tone. For that matter, some of the best formal writing I've ever read had the occasional sentence that began with "and" or "but."
The rule of never starting a sentence with "and" or "but" was always arbitrary, even in formal writing. It always came in the form of "Because I say you shouldn't" rule, rather than one with specific reasons behind it, and good writers never have followed it.
Sometimes "and" or "but" is the best possible way to begin a sentence, and you can't just change such a sentence because of a completely arbitrary rule that never has been followed by good writers.
Such usage should never be overdone, and should be carefully monitored, but there are many times when the best possible first word in a sentence is "and" or "but."
As for using "they," or "their," rather than "he or she," his or her," etc., I'd say get used to it. The English language has no acceptable alternative except for clumsiness, and writing "he or she," or "his or her," is, at best, clumsy for most wrtiting styles.
People have been trying to introduce one alternative or another for many decades, but nothing has been found that caught on, so "they" and "their" are still used, and will be until and unless an acceptable alternative is found.