300
Name three times when a comma must be used.
1. to separate a series of items
(e.g., apples, oranges, peaches and strawberries)
2. to set off an apositive phrase
(e.g., My teacher, Mrs. Goodlady, is here.)
3. to separate an independent and a dependent clause
(e.g., Before the train arrives, we'd better buy a snack.)