Change the sentences into active or passive voice.
1. The dog killed the cat. (Into passive)
The Cat was killed by the dog
Simple Past --> (Helping Verb + by)
2. The boy opened the main gate. (Into passive)
The main gate was opened by the boy
Simple Past --> (Helping Verb + by)
3. The Exhibition was inaugurated by the minister. (Into active)
Helping Verb + By --> Simple Past
The Minister Inagurated the Exhibition.
4. Ramani was praised by her teacher. (Into active)
Helping Verb + By --> Simple Past.
The teacher praised ramani