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In general, you do not need a comma before a preposition unless it is part of a larger phrase that requires punctuation. However, always defer to the specific rules of grammar or style guide you are following.
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.
"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.
A comma typically goes before "so" when it is used at the beginning of a sentence to indicate a reason or result. However, when "so" is used as a conjunction in the middle of a sentence, it does not usually need a comma before it.
A comma is typically used before "but" when it connects two independent clauses. However, if "but" is joining phrases within a single sentence, a comma is not necessary.