Regrettably, my biggest problems with grammar and usage are others' errors. Some particular things that bring out my inner grammar-nazi:
1) Using, "verbal," in place of, "oral." Frequently in my line of work people will refer to, "an verbal briefing." Sometime I would love to be a fly on the wall to see our Deputy Minister give the Minister a non-verbal briefing. Perhaps an interpretive dance to bring the Minister up to date on the status of budget initiatives? Charades to provide information about the Department's Management Accountability Framework?
2) Using, "gender," in place of, "sex." Gender is a grammatical description of nouns, sex is a biological and psychological description of organisms (in which there is sexual dichotomy). As I say to my friends, "Nouns have gender; people have sex!"
3) Modifying the word, "unique." Uniqueness is an absolute state. Something is either unique, or it is not. I cannot be, "somewhat unique."
[/rant]
That being said, I do try to control my reactions--but I am not always successful.
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--James