If you're talking about a completed action in the past:
* Je suis allé(e). (This translates to "I have gone" and is the most common way to express this in the past tense.)
* Je suis parti(e). (This literally means "I have left," but can be used interchangeably with "je suis allé(e)" in some contexts.)
If you're talking about a past action that is still ongoing:
* Je suis en train d'aller. (This means "I am in the process of going.")
If you're talking about a future action:
* Je vais y aller. (This means "I'm going to go there.")
For a more specific translation, please provide me with the context of your sentence.