1, The last time I went to the dentist was two years ago.
→ S + has/ have not + Vpp + (O) + for + khoảng thời gian = The last time + S + V(quá khứ) + (O) + was + khoảng thời gian + ago
2, It is important for us to attend all the lectures.
→ ... tobe important to sb = It is important for sb to ....: quan trọng khi làm gì
3, My mind can't be changed.
→ Bị động của modal verb (can, should, must,...): S + modal verbs + be + Vpp
4, The stuntman advised the audience not to try this at home.
→ Advise sb (not) to do sth: khuyên ai đó (không) làm gì dó
5, If she hadn't drunk too much wine, she would have felt sick.
→ Cấu trúc câu điều kiện loại 3: If + S + had + Vpp, S + would/could/might + have + Vpp: diễn tả một điều ko có thật ở quá khứ.