What is prefixes for possible?

There aren't any prefixes specifically for "possible," as it's already a complete word. However, depending on the context, you might use prefixes to modify its meaning. For example:

* Im-possible: This prefix creates the opposite meaning, indicating something is not possible.

* Un-possible: Similar to "impossible," but less common.

* Potentially: This prefix refers to something that *could* be possible, but not necessarily guaranteed.

If you're looking to modify the meaning of "possible" in a different way, please provide more context about what you're trying to convey.