Either a comma or a semi colon can be used, depending on the rest of the sentence.
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.
Say your sentence aloud. If you find you pause before the word 'therefore', you will probably want to insert a comma. If you do not pause, no comma is required. Use a comma when the sense requires it, not because you have a specific word in your sentence.
No
no
no
Not necessarily. There is no word in English that requires a comma.
yes
no
No, a comma is not typically used before the word "apparently" at the end of a sentence.
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.
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."