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

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I am the new C.M.D.
.
Correct: 
Kindly wait for him. He’ll catch up with you
.
I am the new C.M.D.
A period is meant to be added after a complete sentence has been made.
This rule is also important if you want to appear proficient in writing.
Imagine you are talking, and you do not complete a sentence before
progressing to another; that will make your listeners think something is
wrong or you probably don’t know what you want to say exactly. By not
adding an ending punctuation mark simply makes it incomplete. Never leave
out a period to conclude your sentence.
Incorrect:
Nothing is as sweet as eating candy
Correct: 
Nothing is as sweet as eating candy
.
For indirect questions, ensure you apply a period.
People often omit the period to end indirect questions. Indirect
questions are statements made by third persons. For example:
Jade >>>>>>>>>>>>>>>>>>> → Jude
Jade: Where was the money? (direct
question)
Joan >>>>>>>>>>>>>>>>> → John
Jade asked Jude where the money was.
(indirect question)
In this case, avoid using any contradictory punctuation mark;
rather, use a period to end the statement.

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Exclamation (!)
This is mostly used in storybooks, novels and other literary texts. It’s rare to
find exclamation marks in formal texts, publications, reports and some others.
However, 
exclamation marks are part of the verbal statements we make
daily
. When you, out of surprise, say “Wow,” what you have done simply
shows an exclamation (i.e., how surprised or flabbergasted you are). So, by
definition, exclamation marks are used to indicate surprise and emphasis in
sentences. Also, Exclamations points are those marks that conclude
interjectory words in English grammar. Check out the illustrations below:
I am so disappointed in your attitude