How do I figure out when to use a comma before "so"?
1) I put it on my blog so you can read it. (means: I put it on my web blog because I want you to be able to read it.)
2) I didn't find any eggs in the supermarket, so I couldn't bake your favorite pie. (means: I didn't find any eggs, therefore I couldn't bake the pie)
Do I need a comma in both cases before "s" according to the FANBOYS-Rule? And if not so, why can I leave it out in case 1)? What trick can I use to figure out when to put a comma before "so"?
THANK YOU :)