2
votes
1answer
350 views

Comma before “and that” in a compound object

You should have known that he is quite adept at what he does and that he has the best conversion rate. You should have known that he is quite adept at what he does, and that he has the best ...
4
votes
0answers
370 views

Why do we use a comma before “and”? [duplicate]

Possible Duplicate: Comma before last item in a list Often times, I find myself writing sentences like the following: "... to integrate four granularities of features: first, second, ...