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The abbreviations e.g. (from Latin exempli gratia) and i.e. (from Latin
id est) are often confused. This is because they are both used to introduce some clarification of something previously mentioned.
e.g. The abbreviation e.g. is used to provide
an example:
Examples:
 The buffet provided
excellent variety, e.g., vegetarian and non-vegetarian soups, Italian and French
breads and numerous sweets. 
(e.g. = for example)
He was the
school champion of many activities (e.g., chess, badminton and 110m hurdles).
(e.g. = for example)i.e.The abbreviation i.e. is used to restate an idea more clearly or offer more
information.
Examples:
It happened in August; i.e. two months ago.
(i.e. = in other words)
It happened in August;
e.g. two months ago. 
(e.g. = for example)
Service charge is included in all prices, i.e., you don't have to leave a tip.
(i.e. = in other words)
Getting Them Wrong
Often mixing the abbreviations up does not mean your sentence is grammatically
incorrect. However, getting them wrong will change the meaning of your sentence.
Examples:
All amphibians are thriving in the new
pond, e.g., the two bullfrogs were being very active yesterday.
(This sentence is fine grammatically. From it, we infer that there are more than two
bullfrogs in the pond.)
All amphibians are thriving in the new
pond, i.e., the two bullfrogs were being very active yesterday.
(This sentence is fine grammatically. We infer that there are only two
bullfrogs in the pond.)
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REMEMBERING WHICH IS WHICH
This may assist in remembering:
 e.g. = "example given"
i.e. = "in effect"
THE FORMAT WITH E.G. OR I.E.
Comma before is okay:
He directs a variety of genres, e.g.,
crime, disaster, drama, fantasy.
Semicolon before is okay:
He directs a variety of
genres; e.g.,
crime, disaster, drama, fantasy.
Brackets are okay:
He directs a variety of
genres (e.g.,
crime, disaster, drama, fantasy.)
Starting a sentence is okay:
He directs a variety of
genres. E.g., he directs crime, disaster, drama and
fantasy.
COMMA AFTER E.G. OR I.E.
In the US, it is usual to follow e.g. or i.e. with a comma. It is less common in
the UK. There is leniency in all conventions. The golden rule is: be
consistent.
FULL STOPS 
(PERIODS  ) OR
NOT
It is
usual to see full stops (periods) with e.g. and i.e. However, you can
write them without. The golden rule is simply: be consistent.
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DON'T USE ETC. AFTER E.G.
The examples you offer after using e.g. are usually samples from a more complete
list. Therefore, it is often not appropriate to use etc. after e.g.
since it is understood that you are only offering a partial list by way of example.
In the example below, the etc. is redundant:
 Mark needs
gloves to handle live fishing bait (e.g., rag worm, lug worm, crab, etc.)
In the example above:
the use of e.g. is correct
the use of etc. is wrong
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Easily Confused Words
