A proper noun is usually understood as a noun that is capitalized. In order to be a proper noun, like any other noun, the word must be a person, place, thing, or idea.
Proper nouns, no matter where they are in the sentence, have their first letter capitalized.
When at the beginning of a sentence, it does not matter whether or not the noun is proper: it is capitalized anyway. This is exactly why you have to learn exactly which words are proper nouns by memorization.
Answer:
I do believe your answer is D: Most of Earth's mantle is always moving.
Hopefully this helped! :D
I'm not sure how many errors you are looking for but, this is what I got:
My Father and I, have already several states this month.
I really only see one error. Father should be capitalized because Father is a title of a person. I would also say the "I" should always be capitalized but, it looks like you already got that. Everything else seems ok.
A. Epstein is studying why some people like to play sports and others do not
Explanation: I Already took it
The letter "g"
hope it helps!
