If you want to know how to check punctuation, check this presentation with a step by step guide. http://www.punctuationcheck.org/

1. HOW TO CHECK
PUNCTUATION
STEP BY STEP

2. Proper punctuation is essential, no matter what you’re composing. A paper
full of mistakes can end up getting a lower degree, damaged academic
reputation as well as your credibility. The point is that punctuation errors
happen even to competent writers. That’s why re-read your paper thoroughly
using the following information on how to check punctuation.

3. PROPER APOSTROPHE USAGE
The apostrophe is used to show ownership, possession (Cathy’s
house, our family’s yacht, the girl’s hat) and some contractions
(let’s, I’ve, doesn’t, he’s, etc). This sentence and punctuation
checker can help you out.

4. Also, the apostrophe is used to
point out where a letter is
omitted. For example: I’ve been
writing this essay for more than
two hours. (I have been writing
this essay…)

5. Do not confuse "its" with
"it’s" as "it’s" shows us that
some letter is omitted:
It’s so hot outside. (It is so
hot…)
Do not judge a book by its
cover.
Here are some funny
apostrophe mistakes that
you’ve probably committed
in your writing.

6. PUT QUOTATION MARKS PROPERLY
Did you know that quotation marks demand
periods and commas even if they’re not parts of
the quotation? Check an example:
“I hope you will be here,” Thomas said, “when I’ll
come back”.
All other punctuations marks we put outside the
quotation:
“Pride and Prejudice” by Jane Austen is the most
amazing book I’ve ever read.
To make sure you’ve checked correctly, try this
quotation marks checker.

7. PUNCTUATE CORRECTLY WITH PARENTHESES
Only if a parenthetical sentence is a
finished sentence and exists on its
own, we put a period inside the
closing parenthesis. In other cases, we
write a full stop inside parentheses.
Examples:
She told us she’s going to celebrate
her birthday in The Ledbury (a
restaurant, not a pub). (Unfortunately,
she didn’t invite us.)

8. COMPOUND ADJECTIVES AND HYPHEN
Adjectives that have two or more words are called compound
adjectives and are hyphenated:
Daniel submitted a four-page essay.
She adopted a two-year-old dog.

9. USED COLON AND SEMICOLON CORRECTLY
The colon and the semicolon
both join two independent
clauses. However, we put a colon
to explain or expand the first
clause; the semicolon is used
when clauses are hardly related
to each other.

10. Check examples:
Semicolon: I have an exam
tomorrow; I can’t go to the
party.
Colon: Remember: You can
rely on me during the test.
As an alternative, find on the
Internet punctuate this
sentence for me online tools.

11. MULTIPLE PUNCTUATIONS AT THE END OF A SENTENCE IS
ABSOLUTELY INAPPROPRIATE
Ending a statement with an exclamation point or question mark
followed by a full stop is not correct. Also, do not add a second
period, if it ends with an abbreviation which already has a
period.
I’m working in Yahoo!
Usually, my day starts at 9 a.m.

12. WATCH OUT FOR A COLON AND A LIST OF ITEMS
Remember: not all lists should be
followed with colons. If the
introductory clause can stand as a
complete statement, put a colon.
Otherwise, a colon isn’t needed.

13. Check examples:
Correct: Don’t forget to buy the following products: milk, eggs,
a cinnamon, flour, and apples.
Incorrect: Don’t forget to buy: milk, eggs, a cinnamon, flour,
and apples. (A colon in this sentence is not appropriate.)

14. COMMAS ARE USED TO POINT OUT NOT ESSENTIAL
INFORMATION
If we can omit explanatory matter
and the sense of our sentence will be
saved, it must be set off with
commas. Don’t use put commas
when an explanatory phrase is crucial
for a sentence:
Correct: The politician John Smith
doesn’t give interviews.
Incorrect: The politician, John Smith,
doesn’t give interviews.

15. PARALLEL PUNCTUATION
Interrupting a clause with a
comma or a dash? Make sure
that you’ve put the same
punctuation marks at the
beginning as well as at the
end of this sentence clause.

16. Incorrect: The whole class, students from Royall College of
Music – visited a fantastic opera.
Correct: The whole class, students from Royall College of Music,
visited a fantastic opera.

17. PROPER DASH USAGE
If you want to add more emphasis to
some piece of information, a dash is
exactly what you need. Also, it is used
to highlight the last item in a list:
For his party, Michael got a lot of
food, drinks – and a swimming pool!

18. USING A DICTIONARY IS A MUST
A good dictionary can help
you to find out how you
should write complex words
with punctuation marks: E.U
or EU, students’ campus or
students campus, cold
blooded or cold-blooded,
to confuse etc.

19. REWRITE WHERE YOU’RE NOT SURE
If you don’t know for sure what
punctuation mark you should
use, avoid it and rephrase a
sentence. Don't let it confuse
you. Alternatively, use a correct
punctuation checker free.
More information you can find
in this Google book.

20. Need help with punctuation?
Check
punctuationcheck.org
without hesitating!