Rich: I hope you don't think too much and make things too complicated. Your first impression that "today" is a noun is the RIGHT one. "Today" is a THING, a day of the week. "When is Thursday?"
1. Both are correct. The second has fewer words and might be more appropriate for news reporting. The sentences are so closely equivalent, however, that the differences are infinitesimal. What
The verb is =are=. =worried= is an adjective in the predicate (verb part) of the sentence. So, =are worried= is incorrect. ~~ =definition= is the subject of the first sentence. What is the action
Both are correct. Yes, the second is grammatically correct without the =a=. If you were writing about factors that may indicate a predilection to alcoholism, I would choose the second because it is
1. Yes. The Christian, Jewish, and Islamic deity is always capitalized. 2. Yes. If you are addressing an envelope or mentioned this person in a newspaper article or magazine article, you need

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