Transformation
- Object becomes subject; verb becomes be + past participle; doer takes 'by'.
- Active: The council built the bridge → Passive: The bridge was built by the council.
Tense in passive
- Keep the tense: builds → is built; built → was built; will build → will be built.
Key idea
To form the passive, move the object to subject position and use be + past participle in the same tense.
Remember
The tense of 'be' must match the tense of the original active verb.