`9.`The old man asked the boy if he could help him carry his bags.

`10.`Nhat asked Lan if she could help him with his English pronunciation.

`11.`Her teacher told her to revise her lesson carefully before the examination.

`12.`His brother told him that he shouldn't translate each sentence into Vietnamese.

`13.`My teacher told me that I should practice speaking English every day.

`=>`Cấu trúc câu gián tiếp : 

+) Câu hỏi Yes/No : S + asked +(O)/wanted to know/ wondered + if/whether + S + V(lùi thì)

+) Câu hỏi có từ để hỏi WH : S + asked/ wondered/ wanted to know + WH + S + V…

+) S + said + that + S2 + V lùi thì

- Lùi thì :

Hiện tại đơn `⇒`Quá khứ đơn

Quá khứ đơn `⇒`Quá khứ hoàn thành tiếp diễn

Quá khứ hoàn thành`⇒`Quá khứ hoàn thành

Tương lai đơn `⇒`Tương lai trong quá khứ

am/is/are + going to V `⇒`was/ were going to V

will `⇒`would

Shall/ Can / May `⇒`Should / Could/ Might

Should / Could/ Might/ Would/ Must `⇒`Giữ nguyên

- Đổi đại từ nhân xưng, tính từ sở hữu và đại từ sở hữu

I `⇒`She/ he

We `⇒`They

You `⇒`I, he, she/ they

Us `⇒`Them

Our `⇒`Their

Myself `⇒`Himself / herself

Yourself `⇒`Himself / herself / myself

Ourselves `⇒`Themselves

My `⇒`His/ Her

Me `⇒`Him/ Her

Your `⇒`His, her, my / Their

Our `⇒`Their

Mine `⇒`His/ hers

Yours `⇒`His, her, mine/ Theirs

Us `⇒`Them

Our `⇒`Their

- Thời gian, nơi chốn :

Here `⇒`There

Now `⇒`Then

Today `⇒`That day

Yesterday `⇒`The previous day, the day before

Tomorrow `⇒`The following day, the next day

Ago `⇒`Before

Last week `⇒`The previous week, the week before

Next week `⇒`The following week, the next week

This `⇒`That

These `⇒`Those

9. The old man asked the boy to help him carry his bags

10. Nhat asked Lan to help him with his Englush pronunciation

11. Her teacher told her to revise her lesson carefully before examination

12. His brother told him not to translate each sentence into Vietnamese

13. My teacher told me to pratice speaking English every day

*Commands: S + told/ asked + O + (not) + to V

*Requests: S + asked + O + to V

*Advice: S + advised + O + (not) + to V

                 S + advised + that + S + should +  V