He missed one episode of The O.C. and then played catch-up the rest of the season.
I have but one dream in life, to own a Harley-Davidson.
She swims twice a day, before school and right before dinner.
I passed up the offer although, come to think of it, I shouldn’t have.
Hi, I'm just kind of confused on some things.
If the first sentence doesn't need a comma before "and" because "then played catch-up the rest of the season" cannot stand on its own then why are there commas in the second and third sentence? Why isn't there a comma between "offer" and "although"? I thought a comma was needed before a conjunction.