When Do I Use a Comma?
The comma is important because it separates the structural elements
of sentences into manageable chunks.
Use commas to separate independent clauses when they are joined by any
of these seven coordinating conjunctions: and, but, for, or, nor, so, yet.
Example: Donald loves to surf, so he moved to Hawaii.
Tip:
Be careful you don't jump to conclusions and add a comma whenever you
see a coordinating conjunction.
I enjoying sailing and want to buy a new sailboat.
In this example, we have a coordinating conjunction but it is not connecting
two complete sentences; therefore, we do not need a comma.
When Should I Omit a Comma?
"When it doubt, leave it out." This is good advice. If you can't tell me
why you need a comma in a sentence, you probably don't need it.
Don't use a comma to separate two subjects who are doing the same action:
Bob and Mike went fishing last weekend.
She and her sister were given a free meal.