2. Crowds of people were listening or asking question at the "Speaker's Corner" when we came. (Past Continuous) Когда мы пришли, толпы людей слушали или задавали вопросы в Уголке Ораторов
2. Trafalgar Square was made to commemorate the victory of Admiral Nelson at Trafalgar (Past Passive)
3. Many famous people are buried in Westminster Abbey. (Present Passive)