Not usually. Ex: I will give you a computer including the keyboard, mouse, and monitor.
It is possible but only with the utility of a range of punctuation including: colons, semi colons and commas appropriately.
You should have put the word 'or' in inverted commas, followed by a comma, or you might be misunderstood due to mistakes in punctuation!
Generally, no, unless the word "which" is followed by a parenthetical expression or phrase separated from the rest of the sentence by commas.
Not necessarily. Commas are a feature of sentence structure. There is no word or phrase in English that requires one.
If the word 'however' is in the sentence, commas should be placed on both sides. Eg: Blahblahblah, however, blahblahblah. If,however, the word 'however' opens the sentence, the comma should only be placed after the word. Eg: However, blahblahblah.
They, appositives, are almost always separated by commas. Take the word appositive in the previous sentence. It is itself an appositive in this case.
There is no word or phrase in English that requires a comma. Commas are a feature of sentence structure.
Not necessarily. Commas are a feature of sentence structure. There is no word or phrase in English that requires a comma.
Not necessarily. Commas are a feature of sentence structure. There is no word or phrase in English that requires one.
Not necessarily. Commas are features of sentences, not of words, and there is no word or phrase in English that requires a comma.
Not necessarily. If it starts a sentence, and you wish to indicate a slight pause, use a comma after. In the middle of a sentence but is a connecting word and does not need a comma, unless you wish to stress a pause for thought. Commas are used very often by English instructors working with students learning English as a second or foreign language, to break up sentences into more easily understood chunks for their students.
Not necessarily. Commas are a feature of sentence structure. There is no word or phrase that requires one. For example: I like it too much; I like it, too.