passive is formed this way - be verb + past participle
The past participle of light is lit.
The different passive forms are:
present simple - is lit, are lit - The lights are lit at dusk
past simple - was lit, were lit - The lamp was lit early.
present continuous - is being lit, are being lit - The bonfire is being light .
past continuous - was being lit, were being lit - The beacons were being lit.
present perfect - has been lit, have been lit - The beacons have been lit.
past perfect - had been lit - The lamps had been lit.
modal - will be lit, could be lit - The lights will be lit at ten.