Yes, at is a preposition. Whether it requires a comma depends on its position or in some cases whether it introduces a clause.
He was seen driving down the road at three o'clock. (no comma)
At three o'clock, he was seen driving down the road. (leading, needs comma)
He tried to make a turn, at which point his car left the road. (comma)
"At" is a preposition and does not require a comma when used before a noun. However, a comma may be needed if "at" is part of a prepositional phrase at the beginning of a sentence that is used to provide additional information or context.
no.
Yes, when "but" is used as a preposition, a comma is typically not placed before it. It is used to mean "except," "other than," or "besides" in a sentence.
A comma is typically used before a conjunction (e.g., and, but, or) when joining two independent clauses. However, a comma is not generally used before a preposition, unless it is necessary for clarity or emphasis.
Yes, a preposition typically requires an object to form a complete prepositional phrase. The object of the preposition is the noun or pronoun that follows the preposition and completes the relationship between the preposition and the rest of the sentence.
No, a comma is not necessary before "in turn" in most cases. "In turn" is typically used to show a sequence of events or actions and does not require a comma when used in this way.
no.
Yes, when "but" is used as a preposition, a comma is typically not placed before it. It is used to mean "except," "other than," or "besides" in a sentence.
A comma is typically used before a conjunction (e.g., and, but, or) when joining two independent clauses. However, a comma is not generally used before a preposition, unless it is necessary for clarity or emphasis.
comma
Return to sender does not require quotation marks or a comma.
Yes, a comma should be placed after the year in a sentence when the date is followed by additional information. For example: "He was born on December 3, 1990, in New York."
No it doesn't require a comma.
The comma typically comes before brackets. For example, "I like to run, (although I prefer swimming)."
No
It depends on what you are saying however usually you do require one.
The word "also" does not require a comma after it, but it depends on how it is used. This sentence does not need a comma after "also": Implementation of the Proposed Project also would enable NID to meet future needs.
You can put a comma before or after just about any word if the sentence structure requires it. If the sentence structure does not require it, it may be permissable to use a comma to assist in clarity and avoid confusion. Otherwise, don't use a comma. Have I confused you yet? Using a comma does not depend on the word, it depends on the structure of the sentence.