2 if I saw a serious accident, I would call 115
3 I would have gone camping
4 I wish I would pass the exam
5 I would have bought a new house
Tham khảo cấu trúc câu điều kiện: https://vndoc.com/ly-thuyet-va-bai-tap-ve-cau-dieu-kien-trong-tieng-anh-84970