It stands for "Reply".
Yes, you do capitalize the word department when it directly follows the name of that department. This is the case when signing letters or referring to specific departments in emails or in writing.
Not without permission.
Yes, it is standard to capitalize the title of a subject in a caption in a yearbook or newspaper. This helps draw attention to the subject and make it stand out for the reader.
No, the subject "science" is not capitalized unless it is at the beginning of a sentence or part of a title.
Re means "Reply" so no... Only if you recieved a letter and sent a reply back would you add a Re ****************** The above answer is completely incorrect when discussing letters. It is ONLY used for the above in informal emails, never in letters. Re means 'about' (and you add the subject directly after), as in 'Re: faulty goods.' Unlike the common usage in emails, where it generally is used as an abbreviation for 'reply', this term is latin for 'thing,' where you are using the word to point out the precise reason for a formal letter. Therefore, if the letter is formal, and there is a precise reason for it, as in Re: your correspondece of Nov 17th; Re: dangerous carseat; Re: denial of coverage for __procedure, etc___; Re: replacement cartridges then, yes, you may use the term. It is not necessary, though, especially if the letter is not formal.
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No is not acceptable to leave subject space blank
no, it's a subject, unless your using it as a name of a character.
'RE' stands for Religious Education. 'Re:' means 'about' or 'on the subject of', it's from a Latin word meaning 'on the subject of'.
No, it's basically just separating ideas on the same subject. You'd need to capitalize only if it's required like with months, names, etc. Other than that, you don't need to capitalize after a semicolon.
Oh, dude, the simple subject is "He" and the simple predicate is "loves." The complete subject is "He loves to send emails to his family and friends" and the complete predicate is "now." So, like, there you have it.