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.
Conjunction
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.
No, a comma is not always necessary before "which" in a sentence. Use a comma before "which" when introducing a nonessential clause, but do not use a comma before "which" when introducing an essential clause.
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)
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.
Conjunction
No. There is no word in English that always requires a comma before it.
It is usually not necessary.
Typically, there is no need for a comma before the word "as." However, using one is not technically wrong, just superfluous.
Before EX: I need eggs, and butter.
not in all cases.
you don't need comma
The general rule is that it doesn't need a comma before it. Example: I like apples as well as guavas.
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.
yes
No, a comma is not always necessary before "which" in a sentence. Use a comma before "which" when introducing a nonessential clause, but do not use a comma before "which" when introducing an essential clause.