i.e.: e.g.

To avoid looking foolish, it is a good idea to learn to properly use the Latin abbreviations eg and ie. Think about what they mean, does the sentence sound right when you replace them with their English meanings?

Abbr Latin English
EG Exempli Gratia For Example
IE Id Est That Is
   

Use a web-browser, eg: IE, FireFox, Opera.
Use a web-browser, for example: IE, FireFox, Opera.
Use a web-browser, that is, IE, FireFox, Opera.

He ruined the project, ie, he couldn’t finish it on time.
He ruined the project, that is, he couldn’t finish it on time.
He ruined the project, for example: he couldn’t finish it on time.

It is not difficult to use them properly when you know what they mean.