It depends on the context. If you are listing items or using it as a conjunction to link two complete clauses (complete clause meaning contains both subject and verb), you would use a comma before "or."
Examples:
Do you want juice, milk, or water with your meal?
I will either do homework tonight, or I will go out with my friends.
I will either do homework tonight or go out with my friends.
In the last example, there is no need for a comma because the subject is shared by both verbs.
No. Commas are a feature of sentence structure, and there is no word or phrase in English that requires one. For example: Joe was a bright light in an otherwise dull show.
"Otherwise" would typically require a semicolon before it.
It entirely depends on the context. In some contexts you would put a comma before that word, in some contexts you would put a comma after it, in some contexts you would put a comma both before and after it, and in some contexts you would not put a comma either before or after it.
A comma corresponds to a place where you would pause if you were speaking the sentence aloud. There are absolutely no rules about which punctuation you have to use with specific words. English is not such a restricted or restrictive language.
Not necessarily. Commas are features of sentence structure, and there is no word or phrase in English that requires one.
Yes you can put a comma after or
The comma should come before the word "but" when it is used to separate two independent clauses. For example: "I wanted to go to the store, but it started raining."
no
No
no
Not necessarily. There is no word in English that requires a comma.
A comma is not typically used before "therefore." However, a comma may be used after "therefore" to separate it from the rest of the sentence when it is starting the clause.
yes
no
Yes, you can use a comma before the word "but" when it connects two independent clauses. For example: "I wanted to go to the store, but it started raining."
You do not always need to use a comma with the word sobut if you do, it is best to only use the comma before the word. An example is "The travellers faced a long drive home, so they decided to stop at MacDonald's first."
Depending on what the sentence is about you may use a comma before 'called';however, in some instances you may not be allowed to place a comma before the word called.
A comma is typically used before "nor" when it is connecting two independent clauses. For example: "She did not want to go, nor did she have time."