* Op-: This is the most common prefix for "operate", often used in medical or technical contexts. Examples include "operate" (to perform surgery), "operable" (capable of being operated on), and "operation" (the act of operating).
* Oper-: This is another common prefix, especially in words related to operation or working. Examples include "operable" (capable of being worked), "operate" (to work), and "operation" (the process of working).
You might also encounter other prefixes like "auto-" (automatic) or "multi-" (multiple) depending on the specific meaning of "operate" in a particular situation.
Ultimately, the best prefix to use depends on the specific word you're trying to form and the meaning you want to convey.