The International Dateline is a proper noun because it is the name for a specific thing.
Yes, they are proper nouns and would need to be capitalized.
Yes you should capitalize the name of cities. You would capitalize it because it is a proper noun.
When it's part of the proper name of the inn, yes, it would be capitalized.
No, alcolholism would not be caplitalized unless it was part of a proper name.
No, except at the beginning of a sentence because it is n ot a proper n ou n.
Yes it is, and yes I would.
Yes, they are proper nouns and would need to be capitalized.
At the beginning of the sentence and when it forms part of the proper noun. Example: Symphony Musicians International School
Yes, you would capitalize Twitter, since it is a proper noun. All proper nouns are capitalized.
you would subtract a day
You would 'lose' a day.
You would 'lose' a day.
Only if animal is proper noun. For instance, you would capitalize Chris Carter's nickname Animal and you would capitalize Animal from The Muppet Show. You wouldn't capitalize stuffed animal, it's not a proper noun.
yes you would
yes
In a list, you would typically capitalize the first word of each item, proper nouns, and the first word after a colon if it introduces a complete sentence.
No. You capitalize titles and proper nouns, but you treat a quote as you would any written sentence.