Rewrite the following sentence 16. "I will see you tomorrow." -> Helen said to Nam 17.They have learned English for 4 years now. -> They started 18. I spent 3 hours painting this picture. -> It took me . 19. They had bad marks because they didnÌt study their lessons. -> They didn't 20. If Joe doesn't change his way, he will end up in prison. -> Unless

`16`.Helen said to Nam that she would see him tomorrow

`\rightarrow` Câu tường thuật : S + said to / told / ... + O + that + S + V ( lùi thì )

`17`.They started learning English 4 years ago

`\rightarrow` S + started / began + V-ing / N : Bắt đầu làm gì đó

`18`.It took me 3 hours to paint this picture

`\rightarrow` Cấu trúc : It + take + O + time + to do sth

`19`.They didn't study their lessons so they had bad marks

`\rightarrow` So dùng để chỉ kết quả

`20`.Unless Joe changes his way , he will end up in prison

`\rightarrow` Cấu trúc Câu điều kiện loại 1 :

`-` If - clause : Thì HTĐ : S + V s / es / không s , es

`-` Main - clause : Thì TLĐ : S + will + V

`=>` Unless = If not : Trừ phi

`\text{@ TheFox}`