Comma problems to avoid in your writing
Comma Splices

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Comma Splices and How to Avoid Them

Olivia ate a sandwich, she tripped.
This is a comma splice
   Two complete sentences connected with 
   just a comma
If you could have a period,
you can't just have a comma
"Could I have a period?"
Olivia ate a sandwich. She tripped.
Sentence=Subject + Verb
Someone doing something
Olivia (subject 1) ate (verb1). She (subject 2) tripped (verb 2)
Olivia ate a sandwich, and she tripped
But, you can have a comma if it's comma+and
BOA  but, or, and
FANBOYS  for, and, nor, but, or, yet, so
Write your own sentence using "but" connecting
two ideas that could be sentences by themselves
Eduardo may talk to Arika, but he may not do so now.