Formal:
* എപ്പോൾ വരും? (eppol varum?) - This is the most common and literal translation.
* എപ്പോഴാണ് വരുന്നത്? (eppol aanu varunnathu?) - This translates to "when is it coming?" and is slightly more formal.
Informal:
* എപ്പോ വരും? (eppol varum?) - This is a shortened version of the formal "eppol varum?".
* എപ്പോൾ? (eppol?) - This simply means "when?" and can be used in informal contexts.
Example:
"When will the bus come?"
* ബസ് എപ്പോൾ വരും? (bus eppol varum?)
The choice of phrase depends on the context and your level of formality with the person you are speaking to.