No
The sentence should begin with the definite article 'the.
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.
Unless they are proper nouns or begin a sentence, no.
You can begin the sentence with a modifying adverb clause. "With the proper care, many mistreated dogs will recover."
No. Only if you begin a sentence with it. It is not a proper nor common noun, but an adjective.
Why she asked me, I'll never know. "Why" is not the primary question here.
Yes, starting a sentence with "then" is grammatically correct, especially when showing a sequence of events or actions. However, it is usually used sparingly to avoid overuse and maintain variety in sentence structure.
No, it is not proper english. I would try to avoid putting Because at the beginning of a sentence as well. Try This is true because... or The reason for this is...
No, a proper noun has two distinctive features: 1) it will name a specific item 2) it will begin with a capital letter no matter where it occurs in a sentence
No, except at the beginning of a sentence because it is n ot a proper n ou n.
Yes, a clause or phrase may begin a sentence."As per our agreement, the company bought back my stock options."(better might be in accordance with)
Yes, a common noun can begin a sentence.The first word in a sentence is always capitalized but a common noun is still a common noun as the first word in the sentence (capitalizing the noun does not make it a proper noun). Example:I like cookies. Cookies are my favorite snack.