comma before 'and so' [conjunction]: I had a good time, and so did


Senior Member
Hello everyone,
Do I need a comma before "and" here?

I had a good time, and so did Mary.

Thanks in advance.
  • Hello Akasaka,
    That depends.
    When I learned American English, the rule was that a comma is allways required between two independent clauses. However, my young English friends tell me that they were taught never to put a comma before "and." I think that that rule is altogether too general and really applies only to lists, not to independent clauses, but they take it literally.

    I prefer the AE-form with the comma -- it makes the sentence pause where a pause is needed.
    I see. If I don't put a comma, is it incorrect? If I wrote my essay in English, and wrote "I had a good timeand so did Mary.", would the teacher correct it?
    Your teacher was probably taught AE, so it's quite likely that it would be corrected. But I can't really forecast that with certainty -- the rules of English are, unfortunately, not that fixed. English is spoken and written in many different countries, and each has developed its own variations. Who is to say which is "correct"? Actually, they all are.
    Thanks again Lexiphile. You are right. I checked some of my grammar books and found both ", and so do I" and "and so do I". I guess I shouldn't be so sensitive(?) about this.:)