How do I form the passive in different tenses?

The passive voice in German requires using the verb werden followed by the past participle of the main verb at the end of the sentence. For example:
‘The car is being driven by a man.’
Das Auto wird von einem Mann gefahren.

In the perfect (past) tense, werden takes sein as its auxiliary verb but the past participle becomes worden (not geworden as normal!) For example:
‘The car was being driven by a man.’
Das Auto ist von einem Mann gefahren.

In the future tense, werden is used as normal alongside its use to indicate the passive voice...
‘The car will be driven by a man.’
Das Auto wird von einem Mann gefahren werden.