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English writing tips: Using i.e. and e.g. correctly

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What’s the difference between i.e. and e.g.?

The term i.e. is an abbreviation of the Latin expression id est, which translates to “that is.” It is used to introduce a rephrasing or elaboration on something that has already been stated, i.e., an explanation.

“I like citrus fruits, i.e., the juicy, edible fruits with leathery, aromatic rinds.”
In this example, i.e. introduces an elaboration on citrus fruits.

The term e.g. is an abbreviation of the Latin expression exempli gratia, meaning “for the sake of example” or more colloquially, “for example.” This term is used to introduce examples of something that has already been stated, e.g., Examples using i.e. and e.g.

“I like citrus fruits, e.g., tangerines, lemons, and limes.”
In this example, e.g. introduces examples of citrus fruits.

Using i.e. and e.g. correctly.

One easy way to remember the difference between these two abbreviations is by employing a simple mnemonic device: Think of the i at the beginning of i.e. as a stand in for the first word in the phrase “in other words.” This indicates that the clause that follows will rephrase or explain the first part of the sentence.

And, remember that in formal writing, e.g. and i.e. are often set off in parentheses and followed by a comma; in less formal writing, it is standard to place a comma before and after these terms.