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