PARENTHESES ()

 
Parentheses enclose elements with less emphasis 
or importance and could be left without damaging 
the sentence. Commas or dashes may also be used 
for its purpose.

Use parentheses to:

Enclose a part remark or a parenthetical 
expression.
Examples: 
In this book (I borrowed yesterday) I have found many 
interesting ideas.
The computer (an IBM one) has cost a lot.
Include numbers in an enumeration of scheduled
 items in a sentence 
Example:
The Peripherals of this computer are: (1) Monitor, (2)
 speakers, (3) mouse, (2) Printer, (3) scanner, (4) mike, 
(5)keyboard.  
Include words or figures that clarify what 
mentioned beside
Examples:
She is thirteen-years-old (13)
They affirmed (After many tests) that the device could 
last many years.


NOTE:

Put a period inside parentheses only if the sentence 
enclosed is complete.
Examples:
They affirmed (Many tests had been done.) that the device 
could last many years.
 Do not insert an element without relation to the rest 
of the sentence. 
The punctuation inside parentheses remains within 
these parentheses. 
The punctuation of the main sentence remains outside.