passive voice

1. present tense
formula ;
subject+(am,is,are)+v3
2. past tense
formula ;
subject+was,were)+v3
3. future tense
formula ;
subject+(shall,will)+v3
4. present perfect tense
formula ;
subject+(has,have)+been+v3
5. past perfect tense
formula ;
subject+(am,is,are)+v3