You obviously think your example is passive, and thus has an active counterpart, but I'm sorry to tell you you're wrong. Your sentence is already active; it belongs to the complex intransitive type, not the passive one.
It may look passive because of the verb "be", and "gone" which appears to be a past participle verb, but in fact is an adjective here where it functions as a predicative complement.
Examples like yours are sometimes called 'adjectival passives', but the difference is that passives in the strict sense are always verbal and usually have active counterparts.
Incidentally, I'd be interested to know why you think your example is passive.