Yes, it can. "Neither ABC nor XYZ can/should/are/etc. ...".
No, starting a sentence with "then" does not make it a complete sentence on its own. It is typically used as a transition word indicating sequence or consequence and should be followed by an independent clause to form a complete sentence.
The word 'the' is capitalized when it is the first word in a sentence (as the beginning of this sentence) or part of a title ("The Last Supper" or "The Cat In The Hat") . The first word in a sentence or title is always capitalized.
Sure, as long as the beginning word has a capitalized first letter.
Never. ANSWER: only if the word is the beginning word in the sentence.
No, a sentence can begin with any kind of word. The first letter of a sentence is always capitalized to mark the start of the individual sentence, not because the word is a proper noun.
The word "fall" is not typically capitalized unless it is at the beginning of a sentence or part of a proper noun (e.g., Fall Festival).
...a complete sentence on its own. If the direct quotation is integrated into the sentence and not a standalone sentence, then the first letter does not need to be capitalized.
Yes, the word "yen" should be capitalized at the beginning of a sentence, just like any other word.
It is possible to have a sentence with the word it at the beginning, as this sentence proves.
neither tom or Jim went to the park.
"Nor" typically pairs with "neither" to form a correlative conjunction. For example, "She wanted neither the red dress nor the blue dress."
'In', as part of the sentence 'In the beginning, God created the heaven and the earth.' The first word in the Bible comes from the book of Genesis in the first verse and is "In." It is the start of the well known phrase "In the beginning God created the heavens and the earth."