These eight expressions are often used when something is being renamed or reiterated:
i.e., that is, e.g., for example, to wit, namely, for instance, in other words
The punctuation depends upon where they are in the sentence and/or what follows them. There are six rules; so we will do a few at a time.
AT THE END OF THE SENTENCE AFTER THE SENTENCE HAS FINISHED
When the sentence has completely finished and the appositive is used to rename the subject of the sentence, use a dash before the parenthetical.
...Her ideas were rejected by all of those who were in attendance -- for example, her tax reform proposal.
...We all tried to come to the aid of the man who was injured -- that is, everyone in my car.
Happy punctuating!
Margie