Yes you can I is farley easy
No, you never do (unless a number is someone's name, for example: if a boy in a book was named Ten, you'd write, "And then Ten went out." But only on such rare occasions) so it would be, "He was ten years old."
You mean if you are writing out the number like "thirty-five"? No. You don't capitalize it in the middle of the sentence.
No, you do not capitalize "first birthday" in a sentence.
You only capitalize 'deceased' if it is at the start of a sentence.
You should not capitalize a sentence fragment following a colon.
No you do not capitalize artist in a sentence
You mean if you are writing out the number like "thirty-five"? No. You don't capitalize it in the middle of the sentence.
You do not capitalize chickenpox in a sentence. The exception is if the word is the first in the sentence.
Yes, "nuns" should be capitalized in a sentence as it is a proper noun referring to a specific group of people who belong to a religious order.
No, you do not capitalize "first birthday" in a sentence.
You only capitalize 'deceased' if it is at the start of a sentence.
No, you do not capitalize marine biologist in a sentence. (Unless marine is in the beginning of the sentence)
French should always be capitalized.
Yes, you always capitalize a day of the week.
It depends on where you put it in a sentence. Of coarse in the beginning of a sentence you capitalize space but by it's self no you don't capitalize.
You should not capitalize a sentence fragment following a colon.
No you do not capitalize artist in a sentence
no or at least not any more than i capitalize the word sentence in a paragraph