English - Punctuation - Comma usage - basic - When to Use Commas

5 basic comma rules: (1) IN LISTS: 'I bought apples, oranges, and bananas.' Separate 3+ items. (2) BEFORE CONJUNCTIONS in compound sentences: 'I was tired, so I slept.' (3) AFTER INTRODUCTORY WORDS: 'Yes, I can come.' 'Well, that's interesting.' 'First, open the book.' (4) IN DATES AND ADDRESSES: 'J