200 English Grammar Mistakes!: A workbook of Common Grammar and Punctuation Errors with Examples, Exercises and Solutions So You Never Make Them Again

“Four score and seven years ago our fathers brought forth on this
continent, a new nation, conceived in liberty, and dedicated to the
proposition that all men are created equal.”
Ellipsis rewritten:
“…our fathers brought forth…a new nation…dedicated to the
proposition…”
Comma (,)
A comma is simply a pause in a sentence. It is also used to join words or
sentences together. You should also know that a comma can sometimes serve
the function of the conjunction “and” in a sentence. Many ways to avoid
comma errors will be shown you as you read further. Also, the use cases to
perfectly punctuate your writing with the comma will be explained and
detailed as you read on.
Ensure to use commas to make your statement clearer.
Perhaps you have groups and different categories of words; use commas for
separation in order to avoid confusing the readers.
Incorrect:
The money was shared among his wife mother children company
staff and other relatives.
Correct: 
The money was shared among his wife
,
mother
,
children
,
company staff
,
and other relatives.

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Simply use a comma instead of the conjunction “and” between 
two
adjectives.
Using “and” isn’t a bad idea, but applying a comma makes your writing
eloquent and intelligent.
Incorrect: On my way to the grocery store yesterday, I met a 
tattered
and
grievous
man.
Julius Caesar was a 
mighty
and 
influential
man in his time. 
Correct: 
On my way to the grocery store yesterday, I met 
a tattered
,
grievous
man.
Julius Caesar was a
 mighty
,