1определить видо-временную форму и залог глагола сказуемого в каждом предложении. when the street had been widened it could be used for bus and tram traffic. this offer will be carefully considered by the commission. a new research is being carried out successfully. he is listened to with great pleasure.
When the street had been widened it could be used for bus and tram traffic.
- had been widened - past perfect / passive voice
it could be - past simple / active voice
be used - past passive voice
2. will be considered - future simple/ passive voice
3. is being carried - present simple / passive voice
4. is listened - present simple/ passive voice