`1`. Nam said he liked to do physics experiment

`->`Câu trần thuật gián tiếp: S + said + (that) + S + Ved/2 + O

`2`. New devices have been invented to help people live a longer life

`->`Câu bị động thì HTHT: S + have/has + Ved/3 + by O

`3`. If I had enough time,I could go on holiday summer

`->`Ngược thể lùi thì

`->`Câu đk loại 2: If + S + Ved/2, S + could/would/.... + V

`4`. In spite of having a broken leg, he tried to save his wife

`->`In spite of: Mặc dù

`->`In spite of + V-ing/N/N phrase

1. Nam said he liked to do physics experiment(Câu gián tiếp)

2. New devices have been invented to help people live a longer life(Câu bị động)

3. If I have enough time,I can go on holiday summer(Câu điều kiện)

4. In spite of having a broken leg he tried to save his wife(Cấu trúc in spite of)