Here's why:
* "i.e." stands for "id est," which is Latin for "that is." It is used to clarify or explain something further.
* "e.g." stands for "exempli gratia," which is Latin for "for example." It is used to provide examples.
Why they aren't italicized:
* Common usage: These abbreviations are so commonly used in English that they are considered part of the English language, rather than Latin phrases.
* Clarity: Italicizing them might make them appear more like foreign words, while they are intended to be understood as part of the English sentence.
Exceptions:
While not italicized, it's important to note that:
* Some style guides might have specific recommendations about using italics or not.
* If using them in a formal context, you may want to check the specific style guide used in that field.
Example:
"The author's work is very complex, i.e., it is difficult to understand."
"Many fruits are good sources of vitamins, e.g., oranges, apples, and bananas."